Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5ca3c47e791feb…

MALICIOUS

PDF

84.0 KB Created: 2021-07-13 23:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3169c249cc6927094b7ca3dd752e670a SHA-1: 4dad743282abc3bbea229477b2d2547a932f084e SHA-256: 2b5ca3c47e791febcf907e92c75b5fea4314f5c82e62396e8440721e5518c952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://queure.ru/uplcv?utm_term=wherever+you+are+wherever+you+go+i+will+be+right+here+waiting+for+you PDF link annotation
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6e547c66bdb2b15584128f5bbc057c1e/nisuragakojo.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/35361994081.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210604014823.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/nevakajeloxazupupej.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/99689386671.pdfIn PDF document text
    • https://schmitz.cz/res/file/74664346853.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e76ecb579---jisivud.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07aee46240---18891262795.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/93e7c1e203f4c8a3ca2445e09000f383/93769586380.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/16ed5988c654d965ca85946101a5dd55/doperidijanamep.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7a6e2386d656d4e6079ae42d818015bc/xadedutagiputirimoxu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3b531501---jodewasizigogupofi.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/18820746403.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/fetokotabotusukat.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d31b64ef76b---32140882551.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8da7222ae4c0b61ba5fe6ea6e7edf09c/17526314297.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/retutezijug.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621867359.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/64c09de7e72cc437dba78cc3f5deef86/toneletoguga.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/galisojotonurir.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/5237751288.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/31393371122.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/3695594610.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/vuxopamagonukopin.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 10824 bytes
SHA-256: 3016a88e24415c4f4dc20d1557be09e7b7bac89fbbc26921bed407bc27b454a1
font_01_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_02_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_04_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 16276 bytes
SHA-256: c5f0ece61c9727e56e99491d611af38e35ed7151b4ef3a5795c52d35270dc8f1