Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16bb3de321423ee…

MALICIOUS

PDF

87.1 KB Created: 2021-07-14 03:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47ee49f4a36df150920c8108e32c66a4 SHA-1: ffb51606fd1d39ccb7c2f1ccd8926622af544d60 SHA-256: e16bb3de321423eeaadbbd2155a7806442bf88d1e426c2f5005828a32d02640b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=lil+bow+wow+basketball+movie PDF link annotation
    • http://abacusnancy.com/userfiles/file/sexisemimijatodufosexa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9968b639fb---ziworivemuzumagaf.pdfIn PDF document text
    • http://orem.mn/uploads/files/65855169516.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1qajd29h27rlqfpu2diod4s7r5/nexoputabiku.pdfIn PDF document text
    • https://securitydm.com/slicice/file/zutisodazawuvef.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/mizabuxa.pdfIn PDF document text
    • https://drsaman.com/files/76456096206.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/97bb99b7e049c9b9cc4f217df744e2d6/16106771112.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd64c6d9b91---lokosabimifuzobir.pdfIn PDF document text
    • http://salkim.com/userfiles/file/82035543739.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57826912dd---50675162218.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fa7e36af5---rokilosut.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/47414715003.pdfIn PDF document text
    • https://birotex.rs/images/files/pujozazewoxowowojijojina.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4f48278aba15f63c3f48b7adb5ad8d8d/jogokewupovawifig.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079562c46ce6---mewigogagotovawifuzalunor.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4124ab197d---mokek.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/m66phk43c91ha5f8sq446ie0l1/49240331423.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/38b0ebe3763fa23c01eb017f86c79a36/93138888173.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/74257126859.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974259e9067---tofamilitux.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/hbjb502fq2pme401qldeo53i3u/86166618356.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/jubabukekug.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 17808 bytes
SHA-256: 06c14016e429cfec8792e2f7ec5687d3f8ad33719bb2b342742fa4c93c1ac30f
font_01_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 10404 bytes
SHA-256: 85e79550079e28a198b8af003e4fa920f5c25179e32c22f1ec533c1acb17f32c
font_02_sfnt_off00013711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1