Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ab25e0ddef25a5…

MALICIOUS

PDF

66.5 KB Created: 2021-09-14 14:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8e487434eaa7a445335b0996431ac43 SHA-1: f77baa5233003687a70b774708d0fb3aa17dea94 SHA-256: 73ab25e0ddef25a530929791ba7cb97f86e1f2eb08c79ba44a75a67290465b76
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. Several heuristics indicate the links point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm strongly imply an intent to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=hello+neighbor+outwitt PDF link annotation
    • http://hevolta.com/upload/file/56596945765.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/12597075841.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/65273248423.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/gebofimakarimof.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1e4ea3b8---kebomiwox.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/70358100932.pdfIn PDF document text
    • https://verner.lt/images/files/vumon.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/zemananabizasuwe.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/58401088108.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613026ba1aec6---39288459133.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/kixebanomomasujafi.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/31767780984.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/86140456573.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/12872221897.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/82414907027.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/93531662247.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/votafitaxoviwusiromapolo.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/15798110467.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/90175540640.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386bfa33a2e---15715033994.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/88667850408.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_off0000aa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA79 14036 bytes
SHA-256: fa742d530748b1063d61579ee1a635c4a29d7132b961ebc1611d42740ea0bd58
font_01_sfnt_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 10372 bytes
SHA-256: c4ec83b5adabcc9078ca5520a9c7b5e2a69cc350495f4cdd35e88845d954ea5a
font_02_sfnt_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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