Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af3400251317013…

MALICIOUS

PDF

94.5 KB Created: 2021-08-18 14:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 28a5fd4ead3c91313eccf8737206a09f SHA-1: 792a0b72a444913380e65562de2c7ad8b623fdcd SHA-256: 6af3400251317013699347dd29681b25e9901c30f3418f29abcb3e1a6574062c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and an ML classifier. Heuristics indicate it is a link farm on compromised CMS uploads and a callback phishing lure, suggesting it directs users to malicious sites or prompts them to call a fraudulent number. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/09cbba08df1540407da4a1ca4295cb86/zubigama.pdf In PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/16800342959.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d6dbc2fc4b9fef63d5d2cb5285959dfe/xasuwimafegitub.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/vekevowulavevopu.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/25a3da8b8f7487c9f6201575bf7b3c6d/dafozudijafawogufiwi.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/97882829398.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b3645d686d4b33c787b8e5ceafb2ccf0/purenonusemevoferila.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/73292806904.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/46794032022.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/waxafikizujifafe.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/pakopozakaverusakatigigu.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/a1ce7c31339d1c2fe3a8f82ec939593d/95664669764.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/fanafijulipepe.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/bdjin9krfhqoms2elntaiivmse/68216469573.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/fifakixegakuwikuruwo.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/91696419636.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/37810212382.pdfIn PDF document text
    • http://vieclamketoan365.com/upload/files/jomomorijodigon.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/46007795427.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6086a0e40---24656007868.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611259233ee16---74529773954.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/42471500409.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/97916298229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=avast+cleanup+premium+2021+license+key+till+2048PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000110e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x110E0 21276 bytes
SHA-256: 432d350b64c18deeaf0d9ac29618b1e45016bddf90df5892e9f0314e05815c6c
font_00_sfnt_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 20092 bytes
SHA-256: 5bec93038826fa4efa5c49c065c36f05fa6e7ed6257c3447dc974b07d73238c5
font_02_sfnt_off0001360d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E24 11348 bytes
SHA-256: fbbcf303a02eaf867ceca74253ab4e6c13c4fa2ba529546a414491162035f8a6

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