Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd87516a4a8406a…

MALICIOUS

PDF

96.0 KB Created: 2021-06-30 16:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fb788af2c4fb1163462c068385da84e SHA-1: 65b9d28e4ce80ec702b6f89323c8ae3b9d2421ff SHA-256: 3cd87516a4a8406a397225735496a32dbe62705e97489ff26116574b80d0fe64
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, designed to trick users into downloading a payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 8

  • 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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a25709f1f25---57152597237.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2da3db8c749a635560292b6dea9de81a/zijagonaxeguw.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30e8f2fdf---24435693093.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b22b0cce024e988d5ff28323a5dcbb3d/rivebujisupokugeduneb.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0b6155a70a92a07dbe86f2cd148640de/wurigoti.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e412ac8e8de272b84ed11c95845d4516/16690932793.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b95052d5828---kanebubef.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af7801f2b75---9749974880.pdf
    • http://orderleesushi.com/uploads/files/wolitetagijimozi.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/d7if9d2v43ul004iivm9t4r60h/55065561154.pdf
    • http://zhouzhuank.com/v15/Upload/file/2021625532284661.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a00973e1804---50916447062.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/11768411237.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a634712191c7e52ecd3db64c27ed3fc6/78029798825.pdf
    • http://bilmatbasim.com/userfiles/file/moxurimedudonimus.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a3605f5602d25eafd2c613d9e44df3b1/felebatukox.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b6c881d0a9c8979b81b6106ddd96dbd6/86455519379.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/eea24373f44445388d28848a3420bd92/mufetoxukoxidemakefexawi.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f169c0d405---kimavitivixeferobiji.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/1l3tni4gh5afoosp0h0mjkpj21/wedivexaforadolepiva.pdf
    • https://kientrucqhouse.com/uploads/image/files/gojexilagezoni.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861f0ec31c4---19654437500.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5570ebbde---48401831257.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/69c42a39a14558421e0666ef68a18465/60761033797.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=autocad+2019+for+mac+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 16792 bytes
font_01_sfnt_off0001134d.bin
0bd104a3b9fd58882ccdbeee55dabb5de25549876772141a6a528dacc9edaf98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 18004 bytes
font_02_sfnt_off000142b2.bin
1f81678044ba167e1f06448b020106ebc99e6f0008d90dd1dc7ff42dad621245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142B2 10872 bytes
font_03_sfnt_off00015bff.bin
0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFF 16376 bytes

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