Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a729ecb50a99b0…

MALICIOUS

PDF

97.1 KB Created: 2021-07-04 06:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0557d70dbf45ded3ba60d9d2a5d7e32c SHA-1: 78cb885a63d5137e0bf8bc6154c1984990c43467 SHA-256: a7a729ecb50a99b0930dd8eb84d696061a3b551b87615b7cca85faf96464139d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's part of a larger attack chain, potentially leading to credential harvesting or second-stage infections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb706a5c8---lanivezedaripiwirubo.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/newaxubilesogosigefasoz.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c689133bdd7c91d59a6a931a0644189c/wisugunedibudokeko.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/p35636rbd6hipspn3vas1vv486/zogure.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/127169da02f6da1735a302e63900d8a0/borodisedematulogetukixak.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e660e04d434410d4f162817e946f581c/83754443656.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4e126b70---muvuropewugugewotaniro.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ce5f244bc082ace5e706d6e03979026f/susulafavokaxoxivonebego.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11e450671---29416758578.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1647c3e87e48173eb23c882468a88276/zewosibamadeweke.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d5d3d068c7a---64584711315.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6b8c91c27---24732728563.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da47b3c3e8---32284580832.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9bc725f1e6337fd0d0783d1039175b72/50879740590.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vievj0lmplm9r8o9jhe0u1chqq/livinixedadonatawifek.pdf
    • https://alarrabnews.com/images/content/content/file/wafuloxaxivemiwudosisa.pdf
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/30426997170.pdf
    • https://intellicapital.in/ckfinder/userfiles/files/mekuzuzotivavipawodo.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10ce26092---20964485066.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=abstract+lab+report+example+biology
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116da.bin
e14c725926f5696cb0e113b0b2e5810a6d7e9651de5580b94dd2fbbf71568878
pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 18392 bytes
font_01_sfnt_off000145fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145FD 16792 bytes
font_02_sfnt_off00015e14.bin
a54cbfebe5f51725411eead651b3fdfc294e36b6194c7a50e9c0ff370a6801af
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E14 10952 bytes