Malicious PDF — malware analysis report

Static analysis result for SHA-256 4980ab687a54c9ca…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 01:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89cfb07f4337511d6f7c1b2b57cf4287 SHA-1: 279137e49669cc6fad32cb8e897f537d09893370 SHA-256: 4980ab687a54c9cae9361695cb4f64ebb19278ec6ce39b8a852fb1571509fa28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the ClamAV detection indicate a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=best+haircuts+for+oval+face+male
    • http://maasmartcity.com/userfiles/file/14612027746.pdf
    • http://fluidearthconcrete.com/userfiles/file/mugadunitewetinan.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/171d16547baac46bcdac80dedc8dc6b7/disubazapilalulexutabomek.pdf
    • http://nickels.design/ckfinder/userfiles/files/nupabotataturawudulejusur.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/u4dg7svuf950b43epn0e6ar6bl/pejenamiga.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e6816d2f55678a335018096888088d05/23599376063.pdf
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/jikarofafu.pdf
    • http://weberstellen.ch/userfiles/file/35488452110.pdf
    • https://smartcirclegroup.com/userfiles/file/pifobikaresalipokonar.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/u9oasbfvo6ttfeurcqll3nmot6/ruravegajor.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58a02f07c---xigufapefitizikefumogo.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56aec2f5a---53936314613.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/h8c44kv8sfbdp1pnmmeq3uqbmk/70593867423.pdf
    • https://akproauto.net/nbloom/fckuploads/file/mirebuza.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab940e0bf1e---zimorolejepugapolakud.pdf
    • http://autoteam.in/ckfinder/userfiles/files/kubofajekekur.pdf
    • https://cleaner.pl/userfiles/file/25465629513.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/13227913330.pdf
    • http://myphammonly.com/luutru/files/50020542599.pdf
    • https://baxsporthorses.nl/userfiles/file/96908676671.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/550djq7en8stuh9ldkc9a464a0/wimileronapajejiwetubu.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/qde4ul1t89jtrjm0b7flcsq2s1/dakubal.pdf
    • http://brmxn.com/userfiles/file/20210624175336_60vzut.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0npc6bj0510tgqnltduvkrdkk8/59289384091.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/55eadf71be33050f785fd70108fe02d6/32795232886.pdf
    • 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_off0000f282.bin
77bd6bbb91f730932c6ae01d8868191b24c6ef73c7484f4de25d0306af49c1d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 10716 bytes
font_01_sfnt_off00010b33.bin
e23fac5a1b5566a2d41336149c7bfcd6474f50563c44e8124fd211d96a75d821
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B33 17584 bytes
font_02_sfnt_off000137ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137BA 16792 bytes