Malicious PDF — malware analysis report

Static analysis result for SHA-256 1320fb928786784c…

MALICIOUS

PDF

82.6 KB Created: 2021-08-17 16:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d9bd442fed446634ce73fc9c0101450 SHA-1: 8e1956b87a8fa6580cdad16b5667f06e912368e0 SHA-256: 1320fb928786784c743f88d53747f6c24a243f0c50e22000024e7cd2f0893aac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering via link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.patriarca-batiment.com/ressource/site-image/files/68268804679.pdf In PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/6984d9c0eb14e15883c3911013982466/momowu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c8cac08d---37218255761.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/98755226.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/tatusof.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/siguboraliguxubelumimanif.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/lepupowi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160987d396257a---zemuxulasadewumenazare.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1ut02nbgm2dus2e5qklsjqq4hj/tuvozixanodasoxawuvab.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/20805910691.pdfIn PDF document text
    • http://katachizu.com/img/news/files/buzivoxe.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/3fe674ac3e464c486097b17640e12d1d/58366926881.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0343b697627bdc38443767518e0fb81/rafovasofaputi.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/79655329165.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/65386621332.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608326e9b5866---14771288572.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ca007f0d---disumelakalamomokiseniw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f22c01b8c16---fitemefenamew.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160943140db0cc---91650879073.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d7f296d6b1cf9868bdbd2b7238596d13/tesanevalupi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ade28eb12---vilevomilopuwelamotepoba.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/79846308468.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dce86de5760---77989736001.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/36920655238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sturgill+simpson+the+dead+don%27t+die+mp3+downloadPDF 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_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 17564 bytes
SHA-256: 0e0b644b45957326743982f21ec6d090c88a5cbc4f7d358c698dc633639b3433
font_02_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_03_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 11304 bytes
SHA-256: baba7a0612148675bbac88e04d6e0b6b738bf8ee3c87f4cf006efc112abe4f46

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