Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a8f24112a590f6…

MALICIOUS

PDF

97.0 KB Created: 2021-06-26 17:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4377c16726940c861aa5dc2a3e60a29d SHA-1: ca398e8464c6b7fcd16b4ab37d5944d202e2e4ea SHA-256: d2a8f24112a590f6f03333231a86381fea1b97b028ff60f2140d8eaefaf8f94e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised or disposable domains. The presence of external URIs and link farms suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • 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.
  • 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://szpital-sulecin.pl/images/fckfiles/file/jokajebudari.pdf In PDF document text
    • http://dieta-plus.pl/userfiles/file/68363565559.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///velirezov.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5922c6c6057cf3b368f7f5f8fed7c898/11714547340.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/e7ot9aentehjm4heueckgh6vs0/54689152683.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/86034924151.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083a392e9da9---77747767759.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e90a2b5725---parobodoxizedurel.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c203d300909d89a10cc75c49b56ac89b/wulekosarunubawoguvo.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/bdf35315325b1096c8fe4d78f107e228/ditixir.pdfIn PDF document text
    • https://airbays.com/userfiles/file/jedev.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/q5es0s8hopibckkfsrj0td73gd/pujinelerubogadoxajelumo.pdfIn PDF document text
    • http://waypl.pl/upload/File/52752562610.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/23579788090.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/kotopabubatotiso.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b2dc9db24---widozajebonor.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c40c7f2f7---62946223237.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/bb0ujhbvnllqchl4h2c9rpdu0d/47102249944.pdfIn PDF document text
    • https://nistd.in/userfiles/file/sebapokadapatobiriruxu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1038f91b00f7750807689bde214141c7/xakowunukowalan.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/137935274ee4f4115c4cb2a49bc9af5a/24445521039.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/renumivereduko.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/c3a8b369cf5e3aacdebc3e0e63bdb31e/kogesosexuxa.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8c44a8880a79df3dccf33d29996e57be/15616180665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+python+standard+library+by+example+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 18260 bytes
SHA-256: 1350493ce170036b74bc3d108dd095edc09a208b24d95da86847dcd9905660c4
font_01_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 12464 bytes
SHA-256: 3e21ead532fee406bc62c9e693b1ce5d44d1e3d3d301254102e9c35e9d506624
font_02_sfnt_off0001444e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444E 11084 bytes
SHA-256: 94af98777b43c050ccbdb9f2a57b6c837a3e95f58d5acbf1842e19c4d53b740d
font_03_sfnt_off00015dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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