Malicious PDF — malware analysis report

Static analysis result for SHA-256 9859bf76c1e62f77…

MALICIOUS

PDF

126.9 KB Created: 2021-07-16 20:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f0226de40d853b4d6575e53baf1f0774 SHA-1: 14f454be9383543f0fa03d8d97feb5e20cfa908d SHA-256: 9859bf76c1e62f7709b151a18be733b9b68938e801874f48e5d0d07f0a1db13b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and potentially malicious PDF files hosted on them. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1d2399abef58fcc1ae7da89e96f33bfb/29409805380.pdf In PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714b9d8374e---rolowojifoboximoz.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/26745217881.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fi3vusbi0e3ffl6d2ufi40drj4/70251638483.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/s0ot7gao2ki6s5jsfb1uh193c6/41197095406.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/071d3a7d9bf8b9159af632c0d296191b/42587503935.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160974c538ec05---36494874730.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d2d905b3---towirotaxuvazulezaxozorez.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b258b054f---godiwimotonevaru.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1hm68l3g909el3hq8t7kg5uhgg/risutoxuzevobaboza.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/29f1d6b804c76e195d8d9c6b4ba9a3c6/jibigeje.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/45926057140.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/31872805405.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af60908078c---34116998544.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/71265863560.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5ac916be2---21816964278.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kosivabanelokikegi.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/44496035fa8e767a98c00d88c16d6dd7/wusuwomuwazevebopeladu.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8k36h3gtdp71hgitdfd9tle3e9/93030635312.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/95140245181.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/42119610465.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4f44019a---kitopoxove.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/edqpmhncae42otj00iep35qk5f/jedovawe.pdfIn PDF document text
    • https://hirurgija.me//files/96542190568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=knob+and+basin+topographyPDF 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_off00018f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F82 17704 bytes
SHA-256: 3a2cc94f302039d5e9be39f1b630b9dd037dbbc263cf7e12b5320f920eb64bf7
font_01_sfnt_off0001bdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5EA 10740 bytes
SHA-256: ae3565b21e49dd4d16314c37cbea251515535001130f4bda142114a5952aa86b

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