Malicious PDF — malware analysis report

Static analysis result for SHA-256 884b369f666334dc…

MALICIOUS

PDF

76.8 KB Created: 2021-06-28 14:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba51c5ec9a13068fd6f68695a508fea6 SHA-1: 9fba3ec0eefbdfa8b844b7f1ca082b59934efd07 SHA-256: 884b369f666334dc54629352e889d4cb652a55fedbff7cc5ff912586ef1c8844
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. 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 on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ugafijeoa4l802joasuv8v0b0s/36056923294.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad27011c69---gubatux.pdf
    • http://suachuaspa.com/upload/images-content/files/40601981633.pdf
    • http://harchovyk.com/userfiles/file/dazarelodizejafotozamo.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996afbf2ab3---46603239782.pdf
    • https://bookatowncar.com/userfiles/file/xepibavoj.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8f64e9cf721a00d7121dab88b5b0ea8f/vemotexufarujofoxudo.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c807b7f19e---ragoj.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cdb465d5---mukunorotubofejabi.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703eae1db82---dizizodapexuxanipu.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986bd8cb988---12121804313.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5cef34f49---63486777890.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0e10620a519bc94ed85c47253ca3c618/25918498170.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/efc36103f66a5e86fb4dbc6fda2e90bd/buxeropovorikiwox.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/bizixozo.pdf
    • http://cmtdental.com/upload/ckimg/files/nitakepebiruvub.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kbe9lbvdl0lnhetts8ptdpv9t7/wajuzokuxajedo.pdf
    • https://corpusbg.com/files/fck/file/93226480119.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8659be90cf---pubarewuname.pdf
    • https://altaspin.com/calisma2/files/uploads/29468343818.pdf
    • http://srub-servis.ru/userfiles/file/34773313202.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0459822e9f6ef2260999109b884e6428/51402134200.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b460aa01---5395069156.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/86284e51572e4f19c879e42e3cacbc5e/47404396656.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=word+problem+addition+and+subtraction+for+grade+2
    • 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_off0000c8e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E2 16792 bytes
font_01_sfnt_off0000e0f9.bin
a40a95cdf2d10a0fefdf52f58f66f6a6f659d0abd06c023b1ba6b2e54c87ee71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 11316 bytes
font_02_sfnt_off0000fb2f.bin
df38f4aa50e0b07b13b941cd8716c15af4d2703aaed02f510e74b8be91580888		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 16420 bytes

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