Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6dd5e2a8e4b278…

MALICIOUS

PDF

110.4 KB Created: 2021-08-02 06:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b1a555343892ff452af7f72321a63d5 SHA-1: c6664d716c05b2ddd3a44bdf3a42135088cf2899 SHA-256: fa6dd5e2a8e4b2783b5831485e1a15a707622edcecfff5506a1c10a989606854
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as a phishing trojan. The document's primary function appears to be redirecting users to potentially malicious external sites, as evidenced by the numerous URLs extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://enjoybowlramenandpoke.com/uploads/files/lokewisow.pdf In PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/dopesexeta.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/lenurul.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/31913686131.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c29677a0b48---25088442842.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/30818619869.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/biger.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a8f24026---16930736981.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/fupinirimiwosofud.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210620_CC3F2FD081F8C69C.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/kizigix.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/wogivij.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/82548517735.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/9kd23aebue7schbooukeu5fuh2/53080202081.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/liserinofusakowegoz.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/47780283640.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a8653809---53579221599.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d64ad10fec8c9c9ef5260c9c905b826d/vedipevubezowevumuf.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9b39fc83---nekitusaxanixomefuru.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/16245120755.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9429073a1---xakutivubisiverotutitiwo.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ac5gibdcq3gpibkq1k1vsjlu0d/77952494927.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/6480784206.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/eiudg1r463uh23j5kkq9f4ed71/9109076286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=biblia+reina+valera+actualizada+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off00014638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14638 10936 bytes
SHA-256: 63bca40d5dbbd0c64d0dd42e48bdcc2d70a40fb4daa4ec6da0fae8ba350260c7
font_02_sfnt_off00015f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000177a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A6 19112 bytes
SHA-256: c6742b30572db3ff014daf8b32c2e9dbdc573ce53065bb77696463f2fcc13658

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