Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c19fe6c7abb564…

MALICIOUS

PDF

80.7 KB Created: 2021-08-30 02:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 972db612c355bb167a4f737835fb72d4 SHA-1: 098e469e9b531a5486a2c351cd6676261366a040 SHA-256: 82c19fe6c7abb5642162cf03b9e6d36e0480b1e918f6fb3dffbf6fb419d61dfa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://sentinels.ro/userfiles/file/67151331244.pdf In PDF document text
    • http://multiflex.ru/userfiles/file/zodiguzusunewamonuzakuxan.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/12811809844.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ced9a6f7beaabe925316c59b02181301/50960311310.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/zirafesoduvosaba.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/kesozi.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/95277396765.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/mafuwirivalosapogajotimem.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e748ea3163---bopefifofipa.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8r1mgtae549jh26opscq67gpel/nowinojozesudejewodefu.pdfIn PDF document text
    • http://chemicalengineers.ie/images/zaludud.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazaza.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/71816199767.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7d60e086af72b8b6c1fa39a8a591adf/zuxeni.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/9809551361.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/xivezikalo.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/rezefusuniligivunedul.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/510386d893b120842f7f056cba6f818e/87650552276.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb392d6bc9b---wimexegidabukawewajijegir.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aa8d7da10---jefefupal.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/0a4cf6840229b55ea97bfac7b79ccc00/jewurozi.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/9449636400.pdfIn PDF document text
    • http://bio86.fr/fichiers/15249464596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=word+excel+file+to+pdf+converter+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 10692 bytes
SHA-256: 740d4a779dc63cd6a7ddf3310236f6b2835ab292d662f58aaacf27e97346664c
font_01_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 17476 bytes
SHA-256: 86aed7852883b213b930f223303f00b921caff0dc2e9c7a20c9f28eb524dee48

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