Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b3ebc2561b59ef…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 03:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 854c97e48c30724520a8f9f8c092f1d7 SHA-1: a6bb7d140c902bc1ca847f27d38d242c809af5a6 SHA-256: b6b3ebc2561b59ef5f8b449a61717ba514b0d3a9e3136fed0d0effee04e38d33
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and contains no readable content, further supporting its role as a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a7d514ad4d3f7e70637ad067efdb77d2/33842133239.pdf In PDF document text
    • http://burchiellati.com/file_fck/file/27978010699.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/bofalizimozusedofama.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ea33853c402cebca81d49ddb61e4ec0c/17088671349.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4943565903---8562702683.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/bodar.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/929mv0uv49dic6mig76llkttnb/vusitegorekazu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160824afce4802---dabuxovofesadekopadelij.pdfIn PDF document text
    • http://leton.pl/userfiles/file/jexaxitigukazitef.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/puranawal.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/25849135548.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/mojuvumifanopejikabozod.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ffe95b4e1341d7f29a3c1a6b319153e9/gomunenujodegaxubeved.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/vupoparesebexokigobi.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/pezazolokazuxizimetozet.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/10228672630.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/33c3b62cec6d675811407541b32d4f35/pipajaj.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/ridigaxiwojewasesa.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/80149053002.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/7464044b62e56f4da2d5c87e5fe2c252/75682241547.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7503a3218---6330962932.pdfIn PDF document text
    • http://atek-ent.com/upload/file/pokobasebejitafojeserikel.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/sivariwewujopuxetiwuziso.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/db6283efb391cfabab7c2fe4e18013a9/32622997255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=danfoss+tp4000%2Ftp5000si%2Ftp5000%2Ftp5001%2Brf+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_off0000c0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 17100 bytes
SHA-256: c785df3ffe7cf1a929eb71c2a464c6c68c39e0b6ba18303a267c0e7b707a531f
font_02_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 10908 bytes
SHA-256: 0c96b45ca8a915726f638c2116aa84c17762c9f764531aceb297fee1cfaea506

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