Malicious PDF — malware analysis report

Static analysis result for SHA-256 1264ab55e5e41ab4…

MALICIOUS

PDF

88.4 KB Created: 2021-07-08 11:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bee2c2890b874bee28fdacf0cac4a3f6 SHA-1: 9f2e3339b36ebab096e28b6683c2dd22a33c5d4c SHA-256: 1264ab55e5e41ab4682e9c869b0cb6bf17e9276ed3a68a7be5f8ffb9d22c9aab
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised CMS uploads. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users through a network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ildongwire.com/userfiles/file/toxetarage.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/u4e12r9g0np5l5304sdl29lovc/tujonet.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/rotifilifisisixasu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/63vmjt2d8qnvjj57r6l6hq029d/kagawitaruvakojiwewu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3004916b2---jazizexafiwexapibenulitug.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/io6qg2ejoq7eeq3ed864qil45h/bewuf.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/rulisulele.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/xigovuxevuvuj.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e94a9ad20e776fb14b9b3ba7c5f828b2/69620376792.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/mebinolubitumipo.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/99962921343.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/89345387138.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c778356bfc---54783763523.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06469e663a---80281244230.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebd435ab1---32899259394.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/vudeluwalapuxunekizajiben.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6su05foaufpabhfnbl6mq7q5hd/61523563701.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/35879713753.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/58122490915.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/39554810009.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1d9jd1jdes0piv9ff1u4nm870c/ribamugonakopuwuxu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/cru207j9k4eisr5pg3lje2ll8n/81296323318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+open+world+base+building+gamesPDF 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_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 17152 bytes
SHA-256: 4360960e8ed9aefd1ced9bcc8bb10d2c05ca9285870afaa127de6eb350ba4c37
font_01_sfnt_off00012289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA0 11112 bytes
SHA-256: f104fbd362ade9b6830c1ac37b1641da74ad04e6f85de8b5eb2c2210c348f368

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