Malicious PDF — malware analysis report

Static analysis result for SHA-256 6182c76a5710c5ca…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 08:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dab099552b2c04e3ad217a7a5586edd8 SHA-1: 336176b368e628779364967a0e0a92859d3ff06e SHA-256: 6182c76a5710c5ca4378bdef06cf89d700ecc47450f0c1f6043d7830c3c1fd1a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, which in turn host other PDFs. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089775eeb6a0---tetilogufufebexifijutob.pdf In PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a555d772226b9b156e85da5c36681000/29203553699.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/55108344483.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b59833f14d---jetopebamezizarow.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/45384938171.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/48669083089.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/zetekudefuruj.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0b6ad7ef0a7f0ea06e260159e112d4a7/dopaxibudaruteroboz.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mh27cakinlvfsu8sr6ei68s61g/1027981085.pdfIn PDF document text
    • http://erictex.com/ufiles/files/26594172221.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/zirukuxibirume.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/10667017759.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c562d5e9956ccadab3133531d5bd8879/39991413785.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/xumotanazelezozusa.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def7e9ec8ca---nadab.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/85278073102.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/sozujotomutekedowe.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/zedil.pdfIn PDF document text
    • http://mylodge-naoshima.com/31324108909.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0a92492a33b02fbce9dbad70b3440c55/28869498447.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/utigonuzez.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/uv94pauhf37grn9m8fuhvg5ag7/25167754266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=farberware+yosemite+percolator+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 10952 bytes
SHA-256: 96410e14d8c8b093d83f139cec4cd8759cced6c6b7398f1778294475134f6002
font_01_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 18460 bytes
SHA-256: 8cc96a88e6f401c4edf4dc56ef09a8127e2099d4e51220f153be21d6a25d96b1

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