Malicious PDF — malware analysis report

Static analysis result for SHA-256 630ddf8ee2e99124…

MALICIOUS

PDF

91.8 KB Created: 2021-06-26 03:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7531460048e1287d5eba51057c6dd933 SHA-1: 1ab1c78b0179c68243c4783c161a613a1cb734b5 SHA-256: 630ddf8ee2e99124089eb1e2b23540b8644d4c9bc22fffb5501620d16fae87d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/fe399027b24f42e33c64d12a7e86c73c/xikolipanitulusololiru.pdf
    • http://monkey-do.net/userfiles/file/209901244.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/sdauavtmo9loo921vrg2us0nv2/damijovigufojulezeliv.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf0dd9c51---84230378046.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/4f604bf9c81ca16c966c124cda4bcef7/negirugizorot.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc3805600---nokujaribesadakizu.pdf
    • http://alexlunacoach.com/img/editor/file/33151342593.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16200254259102.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c085f572728---47219063935.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed61848096---tufipaxe.pdf
    • https://mehreganimaging.ir/images/upload/files/47266993036.pdf
    • http://kruengrangthai.com/files/files/zomewuvagisizamoti.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/34769ab16e9eb9e35247f768beb5b396/redis.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/39809a5b29999f0ff1b2d0f5400425ca/90631309587.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=front+of+house+interview+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010306.bin
1a468ba3d8f029da778e3782aea646c5e333c4ff24f4e66d6d3cb11047bffbad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 17792 bytes
font_01_sfnt_off000131b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131B3 16792 bytes
font_02_sfnt_off000149ca.bin
a0cf963fbe03b366ad3990fcaa1f9198fc0bbe0d2109e4bbe56bd30f1562343b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149CA 10780 bytes

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