Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8db924e4875d46e…

MALICIOUS

PDF

98.5 KB Created: 2021-07-01 20:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b24b416a95f5f5544d3e4b578c837b86 SHA-1: 28c1d0ff6e6ce275058a04270aac0ab81f59a6df SHA-256: e8db924e4875d46e6c04965ca988ece33f83d44655a6b2baf83e0effb746719c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16e327456---45346646847.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/37776538564.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866615606ee---92697880564.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf828865db---posasesew.pdfIn PDF document text
    • http://cmtsport.com/pliki/2741189915.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acef764d7b---pejuxilifozi.pdfIn PDF document text
    • https://reniuved.it/file/85292946612.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/ruvazoseginefareredemeve.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/81603720654.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b986cf9eb3d---mufifub.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/huiahf2it18va7ij04unptcbcr/witifipidugufufaka.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/57728133003.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/36370680496.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/20870781208.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d29f96f27e5038b210dd1f5fa150bd93/jirekatapivabilavonaga.pdfIn PDF document text
    • http://promador.pl/userfiles/file/53724401966.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a463ef19247---77589211921.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t1vc05bg5dvvmq7g4ru6qha37c/kajoxazupajovepomil.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/dfotk67dj3entol5fjbrmaqc93/55582272926.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/savarekovugopaj.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/47359535265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=new+castle+county+delawarePDF 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_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 10548 bytes
SHA-256: 3ce550f5da2e60db2888f9ff2a414d3dcb9b322666a6c786469fc726a0e0fd73
font_01_sfnt_off000132d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE8 18228 bytes
SHA-256: 8f10ec9574237ada4e5117ea20bbfa73c3fb48dec4c7244966795ac25a7d205e

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