Malicious PDF — malware analysis report

Static analysis result for SHA-256 489b6ff95ea13c63…

MALICIOUS

PDF

86.8 KB Created: 2021-07-03 14:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: af3de05931e6586f665b9690c91869d5 SHA-1: 86dbcc78609528f64fc26115894d32bbeeaca102 SHA-256: 489b6ff95ea13c63230933da1e135fdf8b738728be7233a23f95643daecd2f80
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, directing users to potentially malicious content. The document body is unreadable, but the heuristic firings strongly indicate a link farm designed to redirect users, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sibsblsqo7ldshmqf05rbfsp04/77323028255.pdf In PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/10010928803.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/fawedaluvepego.pdfIn PDF document text
    • http://www.bandungmesin.com/file/56511111754.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/diwolevugawozikexawuzunen.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ce61c6fa3---narixapofuxukibebonov.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/29923998246.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c065725e3a5---68249160557.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/78862084535.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2r3tqjt0kpjbsj39341hkioe1c/dutamiritijifasuwew.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/78422036716.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/82a73d032845bea97f4d7d8aba5b90d2/zuzetepep.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/55216190354.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/lipepiwitudafidujamix.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/pexigurutabekiva.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608418fd204c0---80063633825.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/romeluzafilabokabemozulum.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3ac4d6a5eec0a27e7aeceb383dbc0d30/4945277866.pdfIn PDF document text
    • http://industrialdevices.in/uploads/68534996533.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/37679460194.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/74267112318.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/51865867182.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/bawamegetosodukifemifeg.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160719a57e2536---zapefi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/srlv72ngq1ofsqphkgj80u59su/tizanataximitodomasar.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c05a1ab287f---viguwazazumixugami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=easy+beethoven+piecesPDF 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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 17644 bytes
SHA-256: 77d168c80c6f10aefbfa8c86728bb6f437e945cc6c57871aa14961ba0d5f8435
font_02_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 10628 bytes
SHA-256: 9f1a31466fdf1bfa87289abea5571e5888dab1fb34bdb0fb43ed2cf7862b2e63