Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf19a142ba79c4e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-04 05:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a7e44891c99c14906be74a1ef6a512a SHA-1: 870b90ea50a22b668c6d893e195d366e48f0fc2d SHA-256: aaf19a142ba79c4e6f118343527c28dea3726014166d9b512c9b5cf2f0edee79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the links as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8865cb3ad3---72714318029.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/d2394273aa0036d0455c1efb17fccf10/xuvabege.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612cef7595839---68062027613.pdf
    • https://greffedecheveux.center/upload/ckfinder/files/zatoxonuzom.pdf
    • http://sjhrz.com/images/upload/File/sapepelimezetasolepeze.pdf
    • http://scandirent-new.ru/uploads/assets/file/30318433408.pdf
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/lopopawaxopilujubafo.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160739060ed41a---dimetulabuzunud.pdf
    • https://ruiguoex.com/upfile/files/2021/06/16/nanozuw.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/niwanobaberofoba.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/82088181411.pdf
    • https://konchris.com/userfiles/file/1630289254.pdf
    • https://przyklejki.pl/userfiles/segowatu.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607abfa394919---woparovapofiwotiz.pdf
    • http://ayurvedicclinic.org/userfiles/file/53808892415.pdf
    • http://sangjeom.com/userfiles/file///bupexalonikokupoxagatoz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819ac153e0b---98113576537.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/togasolezizumaviwob.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b2a028fc---mometuj.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dda58b042c05a1e18f704d6200787826/gotejaregexunagew.pdf
    • http://vitajeans.com/ckfinder/userfiles/files/7165188028.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5cf63b4fe---64828437745.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=carpetbaggers+and+scalawags+worksheet
    • 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_off0000b811.bin
b154eee8a76f7b27f80b98b33b770e21efee1385552b11608cbbf1a57e94b482
pdf-font-stream PDF embedded font (sfnt) at offset 0xB811 16896 bytes
font_01_sfnt_off0000e3d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 16792 bytes
font_02_sfnt_off0000fbf0.bin
74d4e9d130ebf4c72093009683025975b30c3f422519fc2ff99e7a8249f29691
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 11048 bytes