Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fbf596dd4fb367…

MALICIOUS

PDF

90.4 KB Created: 2021-08-05 21:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f437789bc9bd7e57e977423a0282e930 SHA-1: d269ee401d94575a25e512f5302f4ae9a7c5d2bf SHA-256: b9fbf596dd4fb3678975b9b4932952f221549627d66affe7e4a70684c18ad16f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable domains. This pattern suggests the document is designed to lure users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/fapumug.pdf In PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/darigixunixa.pdfIn PDF document text
    • http://honghuibio.com/d/files/kezoludipagavo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7iihnslfchplr7fi92tq5vfupk/bafixojojevazopefovofonuj.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/342ec5508fecc5fa72a477e3fef8da05/10327240906.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/777048qp2bgc1js7m2vg29pb72/wosinepasigepidevakare.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/5ba4b297a485577e9ef13295b2945ead/tufomomadepuropul.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bffd94edc37---muzer.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c29fce50fde---85452099071.pdfIn PDF document text
    • http://novichiha.ru/pic/file/50442435477.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/17671108520.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2b610c46e---85073455345.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f3e36a71e---87584009936.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/79446477521.pdfIn PDF document text
    • https://lemanssrl.it/file/95319708442.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/domewadezebogumutuvewo.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/wexizilu.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/dedezevigabigakabik.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e26cc8d16---54332312147.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/lujamalazi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e78f71987---32660487531.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/jafire.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/81946097524.pdfIn PDF document text
    • https://digiconelectronics.com/media/80789009525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=un+decametro+cuadrado+cuantos+milimetros+cuadrados+tienePDF 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_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 10640 bytes
SHA-256: 6a1f35bddfa14487070d59e6c3dd4013b24a2d225dd4cd5704b6a12fd4bbe384
font_02_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 17096 bytes
SHA-256: d6ded22420ee2641b59b093f37cafc99c2800d99104c0b4b951b0cabc7c815b6