Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2efda7b6f4e40f…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 09:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9710fff1a275386523de79943370d441 SHA-1: 4717dacf7e89f01922659f3b496a4ac1b379b584 SHA-256: 8d2efda7b6f4e40f84b9631f0eb6b9947b2d8048d97b08c880bc56cd51e165a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=information+of+troposphere PDF link annotation
    • http://msamerica.net/clients/873634/File/85935886446.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/04/73883870902.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/c3n3ib53hmpdmgadp6qq9i354u/51217144336.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/10101614778.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5g91j8mra1ior4nbov1aakpf92/63043947893.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/5cbc8f8205cdd4c040b04d47c0970006/vowuwarinowimesapuvozopew.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/287ec5b09ff38f16e1b8faa38ae81dab/45404795381.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/62501096009.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/34696388362.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/jofavodejevozajazot.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/27239703013.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffa1e7934e---1561590976.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/wagipapanilojatizibef.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2046532854---53324448531.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/fatagarusaveguwaxerevot.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/tilifuvu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/m7l25sha88rdr2krvuncco9sau/35394493865.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec49bb5920---30508776058.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ab1055735695054e11b6fde5aeee1bf3/zikusadosu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1e92317d9---dotidipol.pdfIn PDF document text
    • http://www.puhito.hu/uploads/31653877087.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7dea7d4bf1a090ba6db12b368d7b1d60/maveketasujodob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f3cd80e03---sosirebaramepezepoz.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52ac16a8a---26097251115.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705190a6056---96237344289.pdfIn PDF document text
    • 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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 18216 bytes
SHA-256: 8f0636de722cf5d37a1d5a12580fbc8d98da6e789de080a867049fd13efa5e3b
font_01_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001365e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 10528 bytes
SHA-256: ede018abc5f7be493c8e96f1f5c7427466d60637770b71dea27d463a77428c58

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