Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff63ad142dccac67…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 18:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 773a5ad19495a6a00b166aa707135bf4 SHA-1: c79210e5619f2c1bfd4bb0cd36c5ab6ec1b7442b SHA-256: ff63ad142dccac67c2ce2b5f696199bf8bebd87f0f8ad09d6737033b0594eade
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The 'SE_URGENCY_LURE' heuristic, though low-signal on its own, supports the phishing pretext.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xebecdesign.com/xebec/userfiles/file/6502077497.pdf In PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/zosumiseb.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/47906117552.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/12429826053.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/84759523479.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4e0a901fa2cd007bc8bc0d278926e7ae/93647606447.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/vabutisibe.pdfIn PDF document text
    • http://winso.tw/userfiles/file/movorilibawivugitakemil.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ba74324ead69c35ffdb448763d9c4f62/39736481881.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/25951821730.pdfIn PDF document text
    • http://budka39.ru/files/nipitunefobatifena.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///najonanaminilonozuwuw.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/mamafebofafiripedexetajel.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210530_9445721909ADEFFC.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/25461771128.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609273772b4dc---manatalujavirerit.pdfIn PDF document text
    • http://bienbao.net/uploads/files/gumotunoguvanekokomatuta.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/babufedexejo.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/95229087371.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ki88a2ajofkps3ajn7tmkg0kcl/vesidovuko.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d056d97785---42432736107.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/labapofamomenajitopujuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=intermolecular+forces+questions+and+answers+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 11064 bytes
SHA-256: b9a85664957a0d6f74853efac046f3e1a3dd8696297f05105e2c93df8b3bb5f6
font_02_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 17216 bytes
SHA-256: 3b417a3156b7f9e19068e70a8048f8c478019ab63830b84a07e263f62c3dee19

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