Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d50b878fccd4476…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 13:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4628ec5b83f8e7e71516e515c7c36bc3 SHA-1: 792a236fb95b51f63f3c2bb2adbd196ae00c0da4 SHA-256: 1d50b878fccd4476f89dd754f9981831265d9a2688c36a3793deedff52a4b5f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1bdd36435---ramofaridufonekaxofosive.pdf In PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/46788fd6be321810c362cfa131864a32/21131863379.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ccd8e563---76586663259.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/35938374527.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/93164129892.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/d1dd4235db5abc3322ba46eb73fbfb85/lapuvufikijuvabotikifo.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/fakowozit.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/kufemuti.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/givodamuguziv.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/i25j7ltqd661qv63gpoiv1am9g/5965504350.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/fusodovataralosafedof.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/392026893638621d1bd2483cf1eb7822/42830608536.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1624855951.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f13407e3---39363941441.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ftb2873g8lugluv80lqml5ujct/gekekapapugaziduse.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/93b6427d8ef0dbfa7377dbcdc9eff026/lutitaj.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/47022170118.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/86568717440.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b56f82407ad10a2dd3b51c8ba7ad7311/mezajikajaxozodatebogir.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160907c29a575f---60382291667.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/difebigexuxupumipebelezad.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/50611520197.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/30145323760.pdfIn PDF document text
    • https://fultoys.com/userfiles/58859979432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=doterra+deep+blue+lotion+pdfPDF 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_off0000b639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB639 10564 bytes
SHA-256: d0cc114b4055ab246305c0485dce44da15387db562870a48a2753833b8c6e552
font_01_sfnt_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 17828 bytes
SHA-256: 7a348f2c6e4ee3713ab5d4be056073da02b0884ca5d461b80076022641188cad
font_02_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1