Malicious PDF — malware analysis report

Static analysis result for SHA-256 85860611714ecaa1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 14:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b2869ea102943ee95dcf64bf886fd16 SHA-1: 564f061cbc66437d9fb84a5c5212c6f8a2fb7417 SHA-256: 85860611714ecaa1a1e806f6afc842cd54e62a5996cff42415a4a553df0db480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other potentially malicious domains. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware download sites, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b1400ad2---zuwaxakomebetuma.pdf In PDF document text
    • http://houstontca.org/Content/uploads/files/112970392.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af7475af978---38731072214.pdfIn PDF document text
    • https://belloverde.net/emailer/file/57359876878.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c56de497a557070377e46617b8a80ef9/13599069652.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/jl7ibva87bueifteol78a3flh1/fotewezigup.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/rugelofutonedebux.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb7cc9e8e---pupiwibedexupi.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/lugizavikefabadugudo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/i4657rbkm6o0aj1smsgqlotdem/75323865352.pdfIn PDF document text
    • http://mayjack.com/upload/files/91955887627.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/nixelaxolejafana.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/8264696306.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/refamesurarelubexop.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/xixizegupuke.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfbbbc1b43---bekijufotufudeteb.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/cd09929ed0b9577427a15f2fc7eb86e5/runuj.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/49656939821.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/70811956134.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/jijujemogodisa.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/kerefaxedogelik.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/todozasizasixetasunepi.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/miremoger.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/adf48a824db0b39304b332181c409f27/vebegivuta.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9106ade3e89e135ca8642dcf99fb1258/noguseruve.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/5906681258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=livro+gustavo+cerbasi+pdf+adeus+aposentadoriaPDF 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_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 17936 bytes
SHA-256: cd485d195bc9ba657dda9118b7c18268dd127fe17ca15cc65f6bcecda8eb18a6
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 11012 bytes
SHA-256: 64b42f1b84115c9edee6f9f0ea0d22d793abed7cb7a8c4041867137b2dbd48c5
font_02_sfnt_off00011a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1