Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb938749953a1a7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 23:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8aea2d1803af62616a670b558fd93760 SHA-1: e964ed2ec73ada92fe1c6094007f415dba6504ac SHA-256: afb938749953a1a7a671dc88f5c362f094e7a5b072b44575fd0cf84b52f5acb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccbb07e490---9094917681.pdf In PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/wujedoxubi.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/45840840249.pdfIn PDF document text
    • http://skisun.it/userfiles/files/12559065849.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138138ee7906---lazow.pdfIn PDF document text
    • http://stefani.cz/fck/file/faxitexesotojitesukok.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/mijanopenuwazaler.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/1447a1fdb828355f9f1b736e75940c1e/52450620183.pdfIn PDF document text
    • https://loctra.net/userfiles/file/dadinijojine.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/27824469407.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/8625833519.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/3589902060.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/kikam.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/mopogoxowajojiwuvujame.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa3ac1c75---26154386294.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/7904171582.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/goxefemoxirevur.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/80393868222.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/xunekudume.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/lumujifobowariwawefenisal.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/lijumutesufurazadezeti.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/73068289678.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/80478359438.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/benivukesak.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/22021202826.pdfIn PDF document text
    • https://csodamalom.hu/files/files/41318848265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pou+download+mod+apkPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1F 10240 bytes
SHA-256: 8c598fc570fd08d557c981c75513bcce8bc36612f0357471e029e81c02bf56d5
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 19316 bytes
SHA-256: 798aed70971dacd0a5dfc356f7d0766f9e255cbc1f438e3be67d86965f7ef2e6