Malicious PDF — malware analysis report

Static analysis result for SHA-256 63736a26d13285a4…

MALICIOUS

PDF

83.2 KB Created: 2021-08-18 08:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0e7f81bae550f8562297b025f76a3fb SHA-1: 41513f8a8d6d0a99010ccdafd1a2b1b3178353b4 SHA-256: 63736a26d13285a4244d27007dfea86532bdba02c4ebebd72dade2b3c5f1876d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and does not provide direct user-facing content, but the link farm structure is a common tactic for distributing malicious payloads or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fongyoskert.hu/userfiles/files/2024777249.pdf In PDF document text
    • http://cortabellanews.com/userimages/fijusiwipekuvonilivovi.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/gijazawagalizogusuwusor.pdfIn PDF document text
    • https://x-software.cz/data/file/bofufagek.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/09410f60b75736ae56a4a5bd9462392a/45351854184.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/15novo759mnpu2nfbm9a7j3nqg/60128873902.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/mefeb.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e871fbbfd17---68164380848.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/jf1gk36dofta5ajta8lqlvp2d4/safanozemamupodojile.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/ratotuganofaxanogidum.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1p21e9vriq03p8rdvtd87snsf5/78125126426.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae607af72---wusazifefafalosatiranowu.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/98bd08af1f89ced46d3c82da886e5782/20806028540.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/s418rtkacnf97blcvropf13nv7/7818131656.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64fdd49369---98346527452.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/jozogenobulewodigiwatupav.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/mirudaxopodogakodagudinat.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/6197006327.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf02bb971---wagafo.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/varevusotawevoweni.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6e670de47---72648713556.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aafc65548---wetet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+better+individualism+or+collectivismPDF 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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16816 bytes
SHA-256: 6423e76ce364b4c1aa6f950db85e62b4d76e69a90128af31553ebbc8019ba505
font_02_sfnt_off0001252d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252D 10932 bytes
SHA-256: 33f4c24b254b4c03078834161e667e45c8cba7b4f4932b9b5c96dc93719d442b

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