Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09b3365097db366…

MALICIOUS

PDF

97.9 KB Created: 2021-07-06 13:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8aef21c3cfba1f6a692dc0b49056f345 SHA-1: 374f4976b2ad283ee715ca7f212dcb9e1be7f423 SHA-256: a09b3365097db3669b165db51bc604a19d044dfd23bbb342ae565cdfcd67a7ae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content or exploit kits. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to lure users into clicking through to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9705

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=restore+in+hebrew+meaning PDF link annotation
    • http://beastyenergy.com/userfiles/file/perixodurozuje.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fcb2a02b2---16266187918.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5e72ad8ad96ec407a2b41870a590a2b4/fufozotopekawov.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7ddcdd95cd66a5521fe0fa748a222cb8/95297966817.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o4edo019542ic0ukct0pc52g2l/xijituze.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/7291469163.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/65419789258.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/272bdf4fbc9d13a06ea91ff95118d30f/39945860136.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/zaxiwalomem.pdfIn PDF document text
    • https://ptogel2.com/contents//files/sofojiwulipeduvozerubozok.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb50360a79---papexe.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d863f495---37788938854.pdfIn PDF document text
    • http://cartopack.com/Images/file/84786053774.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf2a81955---96699208341.pdfPDF link annotation
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ef5a0a0374d1e834cae5dd996695ea6e/24960597004.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4d3bc2d89633f610a0d95d229e0740c0/zisadusobamokolupubuvum.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/73253603530.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/rurivudurim.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a53d21fb---jofaligaxukegazajan.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ace92aec74b5945a6b23eeda31152a6f/rezusududugudav.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160760231c7ad1---rofeb.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc471e636e---tofavojizewer.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/17668400063.pdfIn PDF document text
    • http://sam-global.info/files/file/64293950258.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9c6efc3970d5ba15b78bedce77f001e0/dadaxigibekemerobi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ffc44de46---tajerizomibabotipoji.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a160e3fe---32547797156.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/79341239655.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 10780 bytes
SHA-256: 39274b27dee153724c6b86b579fa7f238aa308855a523c2c0bd4007172169e76
font_01_sfnt_off000115b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 17520 bytes
SHA-256: 7a1a0d5705d1b7be77f2112add2e524ae56726b66cdf85e9ec4f0af0c66a9fa5
font_03_sfnt_off00015b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2B 18156 bytes
SHA-256: 68140aa1974c4ffb34ca2c952c11be1a402fba90abe4266313d56137dd6af5e4