Malicious PDF — malware analysis report

Static analysis result for SHA-256 b539c2e010ef5c79…

MALICIOUS

PDF

93.1 KB Created: 2021-06-26 02:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ee63170e4c68a44f276d5cff62e38f42 SHA-1: 24d8e13efaae6b367437c0234058ce8de1c05516 SHA-256: b539c2e010ef5c7913216e6a54a1e76aa5f278f6e278f5af92cb66e9057198cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5e99edcf328737ba4e0eb2000afa8a36/fexaxog.pdf In PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/63056382223.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/84230211736.pdfIn PDF document text
    • https://limsurdua.com/contents//files/58079411819.pdfIn PDF document text
    • http://terminsk.by/pics/files/38629959763.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b48da52d3cd---57735401977.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8a57e7cb---derizilixosepeluzolor.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qdh17oke63jm9791t7lji0k77e/podadiwuduvejapinegusiko.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/16042951906.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6466c4e588---51544053112.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/3394e6bpetqqvb8t64bk79b6c5/sarumiba.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a520158245c---turakob.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16092105e6b7dc---93165997946.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1aef3f9dce98df5d852d559e55aa424e/tananugaxibanefawizofer.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a359e2064cc17411551b31a2c46d6162/17063259572.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60CA118B036AA.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/d8eb9112ff22d41e31b471c0e4aa8e6d/40398475574.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/c569nkqprqqka4n9fu4pq6a67s/6231717353.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5e7ceaa72---zawawewusabavezagonap.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/61796873824.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/47304576310.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/a894f94a661faaf43b5ceb26dd478a26/tuxemana.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/t8798pssged41ou8im6vsi9o70/81879259401.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/sovez.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090398200204---refewonivijulikovuxugak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+did+the+crusades+affect+the+churchPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 10600 bytes
SHA-256: 111211b088195e63f142389fd4f4bdee932b08ab6434f54956638ee8784d3352
font_01_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off000123f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 16264 bytes
SHA-256: 2a24714807f6516d33f3cd5dc2532a800434104ea13fcb599b438e213a56c672
font_03_sfnt_off00014e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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