Malicious PDF — malware analysis report

Static analysis result for SHA-256 476612221360ccc5…

MALICIOUS

PDF

106.1 KB Created: 2021-08-07 16:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f7cab558774db829d010bfba36815fc SHA-1: d6a34a53fc911454473ce218c5efeb7b78987acd SHA-256: 476612221360ccc5293401d7b9154abe7ff7a58279cd2782824e6c0a362ca469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious sites. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/mi8manvqfd220ne7nidm81117a/79301107363.pdf In PDF document text
    • http://apsons.eu/files/file/47790534842.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8418bbc977---mevexud.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f4fe1d14---didopuloburapezedarob.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/35157fd22ac497974dba0d7dc231fd9e/59118180643.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082551cabbd5---76623269326.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/64729980548.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/bj3bqv2q7vvdb7a2eeco17t100/kozivexa.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/xugowipabikisuzitapofor.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9741f5b9---gokapobadomumi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea83b9362---48610427835.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/dbf32635733d54ba227aad04506ed345/lokoritexewi.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5ed029f2---gawatirusufevopavu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9ed5e3ea1---sivisixir.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///68309077481.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8fbf1c1da91a9e65d506efe4437efa31/45664054780.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdc1cffdf---gokuliranubiwamuze.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c65fd01194b---42673282307.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/2810597919.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/33376649755.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/13520154807.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/xejodemovopemefom.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/mexevawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=feng+shui+flying+stars+period+9PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 10488 bytes
SHA-256: 873bfe6c60474bbcae5859fe1fc9e8306125b5be3918351ed456f4660f669a6d
font_01_sfnt_off000137cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 17944 bytes
SHA-256: 64df66a0297769549a266d45a44da8a33666ad5d90eaf25c18f77618f947bc97
font_02_sfnt_off0001658f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658F 11136 bytes
SHA-256: ae72aa86a699623496d552245f2994daa1c5f4c89adc0bfea1b83598476f3634
font_03_sfnt_off00017f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1