Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d042d5f818cd05…

MALICIOUS

PDF

104.9 KB Created: 2021-07-01 21:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 88c0b6ce019c36ff9cdeedac51c1a18d SHA-1: 4568ead6ba5969ad50fa17bd86ee3a2a08719f05 SHA-256: 13d042d5f818cd0522ec5dbc11e78a5ab7e7bdab51f4953c9fc74f388b691011
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as link farms on disposable or potentially compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://redfordunion70.com/clients/869360/File/zazax.pdf In PDF document text
    • http://coming-c.com/userfiles/file/suwedewubepurotu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb06e3a8b---xidegixikakagim.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621564412.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0829be1d5d---radazewomozu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a4dc7bfe45a0b883eb76d821bed7bbbd/34797609491.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb5abbef47---fafoxopezunirizenino.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/04e992bf1fecc3b97a8035a5463f7b40/ximilopojilirux.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/34acfb84c4492b99175f91337330e9bf/kareganu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d86e64d4bc---nigavuketodoxizineme.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/06d7930b7ce7c501dc91ca5fee0f0d03/tomimizavidiganasefol.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9640c784---mumozidaliwinor.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d964f7a42308c7b163c95859b7eeaf51/33395267316.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/tapubibedusixunedir.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/00775b26bbb762f94165d689431fa2ff/tonigedavadef.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6a472a48---4983870106.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/vonegutajitarukutoxaj.pdfIn PDF document text
    • http://aimic.com/userfiles/file/xogifati.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/16230621188.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2339a21c4---lomezowumejawofokamixone.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f0e7416b4e8743de8f53308636bb3a6e/13433938826.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d039342d---dizelirejuxemamogubixug.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7dcf4431853bd8675ee75975d0a548e7/78590056335.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d1d6305180b90333a07b3959c1e6aa0a/tulevugitiwik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=meaning+of+torn+in+englishPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eb6dcc347---rijitijimav.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001677b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1677B 24516 bytes
SHA-256: 4d135c4b40dbb02418187face5a224ee947a3fbc9b567e063b462900e0a53b85
font_00_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 10484 bytes
SHA-256: 0372644e805e663ea73a69cad6fd9c94525e29fdc428812767a99c9c8f03df63
font_01_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off00012ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED3 22824 bytes
SHA-256: 25277ef72c5d30d6a7d3a8af84694038335390849c37151a19259b0d238c4087

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