Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77e97bb8bc483a1…

MALICIOUS

PDF

95.8 KB Created: 2021-09-14 03:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 845f40b53d67892291855e5a9f824b46 SHA-1: 46a3df2e88517b825d750727d7df425ecffae9e0 SHA-256: a77e97bb8bc483a1a7e2165c31678bf3f4530b1f831129fdebc382bbbe27f105
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a strong likelihood of malicious intent, likely to direct users to phishing sites or download further malware. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://4x4autok.hu/userfiles/files/40391379973.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d970252c00---66797288624.pdfIn PDF document text
    • https://salwangurugram.com/files/99362023049.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/29634101430.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a73d2196d.pdfIn PDF document text
    • https://labelmarket.pl/data/file/84921912777.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/vanufituralamomagomedam.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/136880054.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/60786620473.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/tugezopugup.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/bulapuvufuni.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o6pkhrlrs1u2oh33mkvviocav6/wukavon.pdfIn PDF document text
    • https://e-room.co/userfiles/file/senifolexude.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/durateripevuloletuwigab.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/n81bnii8cnf1obbnktkuguuv2g/poxasanefitawupevijasija.pdfIn PDF document text
    • https://wsbtitan.com/images/file/6901596966.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/barimililegerisex.pdfIn PDF document text
    • http://vhktn.at/images/content/files/83792425429.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/40757450081.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/gijigop.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d9cafb3f3bad357c6b03563049235004/72084108946.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/fipiduxug.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/butalefabomukajadixawizu.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/wobefonadutaxegixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+kodi+for+firestickPDF 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_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 18216 bytes
SHA-256: 4f861cf036bd5cc35d4a4056c418b798c38a69418f8337b11c614b51688bff8d
font_01_sfnt_off000141ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A16 10300 bytes
SHA-256: 00644cce56d258cc12599f163323e72caf6fa8aca609aa2aaf1b1d6a8ee5a344

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