Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a972ff3626c36dd…

MALICIOUS

PDF

143.4 KB Created: 2021-06-25 19:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f2ccbc1821440b56d71904e1785d331 SHA-1: f93cfb2f3e8cb456eb52fbe83351d33023775799 SHA-256: 9a972ff3626c36dd4cacb74f8545dba09e0dc56cc5b53bd9c25487fbbe85692d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to distribute malicious content, likely another PDF or executable, via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://axwelindia.com/uploads/46475481906.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608661eba2b59---jutifezetutigikedurexo.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb04d5e007---77003540754.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/714b0be5f47085841e866455e2eb9792/ledapobipekofu.pdf
    • https://hondamienbac.vn/userfiles/file/89546062993.pdf
    • http://dagmare.de/userfiles/file/44869047495.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/nazozepisororomimeje.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/pvi1hfb5reuk4kvl98q2f88g4u/84229410410.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d3f7f6b40615fe2ac639fefbe77b43e7/jadolodolufal.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4649e07eef---nelukamewoliwesol.pdf
    • https://liniagdanskzydowo.pl/files/welexabutatuxixawuvawu.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7cfd5a68---viregikafotejuwed.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ahnmh6vo4em4kpvf6tu063s0fr/bikebefumusejibi.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfffae1a32---genugitivusapivexijapulu.pdf
    • http://reelproductionshd.com/userfiles/file/tajazujepurugexosidotovuz.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/64105219653.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1218305330---fimisap.pdf
    • http://humanitool.ru/userfiles/file/xudobobonawitiv.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/60872140942.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160724d4c3516d---92736801505.pdf
    • http://aapltd.net/userfiles/file/xujatineputim.pdf
    • http://beastyenergy.com/userfiles/file/jupepafew.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/wunoremiminatipezipow.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/13d04961e0ca24b762bb45088ac29524/goziveximaruxirasuwu.pdf
    • http://beijinghuojia.cn/userfiles/file/fonedotefobuveg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=shell+shockers+age+rating
    • 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_off0001d237.bin
b45f49b05227e02bf654c791eef69bc5041f66827505660885b01f74ab4b08d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D237 17388 bytes
font_01_sfnt_off0001ff5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF5E 16792 bytes
font_02_sfnt_off00021775.bin
99d60f0171df2c86d2082b134dc945edf40d6839e3882a4277c23cc638c95204
pdf-font-stream PDF embedded font (sfnt) at offset 0x21775 10676 bytes