Malicious PDF — malware analysis report

Static analysis result for SHA-256 490d1cfccfaeff61…

MALICIOUS

PDF

107.0 KB Created: 2021-07-14 02:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d055adacd4b582946fcfe8f5ca8d2b33 SHA-1: 88fa08d7cbab52ba44c89566bf72dfc9f3145dc6 SHA-256: 490d1cfccfaeff6103d5e8a24e7ac0e0a904f471a55bdd83f4ea6800e7ac0083
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/bc2fcacd036a2a2812987f3390759732/jelejokexuzeragokewiver.pdf In PDF document text
    • http://immobilieninvestors.de/userfiles/file/54764237344.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ea059ce433f6344b421e1f997940ce92/95085038919.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160857005e9593---mowanaxodiligeresidu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/57f8db1352f1807eaed6ce2a0705361f/vavunifovu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d86ef626040f00c2b772d5bdc724acd9/xodafidu.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/pikavabomifadexidemud.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/lph472cd5l5qphnnf3vo1d6kil/83101520841.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/zajemirifomiloz.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/11095943275.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hgsltkepvp1fb54rq4t3kh2cv8/nogigole.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/49usscpqd1jngacfh22tmb5e37/79869821661.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9f071a1d---sopivudamonerogovab.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bhp3pbk7s7meav8t93fti3l1ie/wuwogu.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/jobowokorejukenubebubopi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/64f8e2fc5b7f9d2950e3facdf3c68012/majef.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/wegavabu.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/90547833921.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81628fdce---rerejeru.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/17803309189.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0trnblmas2i09j2ofrdkjm3em3/67770533507.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/tegesok.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/potowuropisibibinizevaxaf.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7a1aefee5a856ff27fcc0ecec7a9d39d/kotiz.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/85977920004.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6258f4dd2c736d08f922724b6be0509d/fowabesagaxemigepozivizuj.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/50f10f57b422c4c6f9cdb3a1f4580939/49795595419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=investment+in+national+income+accountingPDF 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_off000141b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B6 17336 bytes
SHA-256: eec520c1ce7151551becee264a67b6626923dc8fb7ebebda787d24b56f1be5a3
font_01_sfnt_off00016e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E11 10592 bytes
SHA-256: ff798451a12d019dc98cbf4c412f7ebfcef4108149efce9fed3fb1f934b42648
font_02_sfnt_off0001864c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1864C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1