Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e006cc3e0ca562…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 17:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a820cf240ef6c274895612221ad2fc26 SHA-1: 3d723c4856f4c29d7bbf56a2cae5729ad985552f SHA-256: b2e006cc3e0ca562727cc3fd4c31677eac8aa7dc89fa8e5bd14549aead7947d5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and a high ML score indicates a malicious intent to redirect users. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://prestinieurope.ch/userfiles/files/lamojenaf.pdf In PDF document text
    • https://wupaojichangjia.com/d/files/67307027654.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/dipavizikojalurogi.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/60880167747.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/dab9fc0ca69c2273d7aa2f9fda17b681/xogitukowezogi.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/10743790259.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/fiwuzawivadipixonuxaviv.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/perilewonitibameliwawomor.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/45889308076.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/wetapuzesebiwipezope.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/111836386061434780a5d8c.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/farujivosutewopibapuxu.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/15869340466.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29cee8c606ac4e1d96e3991dbfb783c8/758041068.pdfIn PDF document text
    • http://net-work.cz/data/file/jodebepasotifopil.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/duvovedame.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/55150934208.pdfIn PDF document text
    • https://uangraja.com/contents/files/18339993435.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/davipifegamapawijujuvaj.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/7411581868.pdfIn PDF document text
    • http://precisao.net/files/files/40968421026.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5547e2ac---18834011110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=my+talking+tom+2+mod+apk+unlimited+moneyPDF 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_off0000d515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 19040 bytes
SHA-256: 5aed3afe37d244ac2f3e8db10f8f13bff94b9e65bfb51e12479d1241280c2df8
font_01_sfnt_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 10888 bytes
SHA-256: 6c1c5f96e482a6761bef5a20d05008a329a4f93441ef884f610719811bc1fc9e
font_02_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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