Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba71fc475091027…

MALICIOUS

PDF

89.7 KB Created: 2021-07-08 20:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b4eb7a65f24ad676b2ae22178f80265 SHA-1: d0692c0dcdf4f8e03379f9a4320ea186273f8425 SHA-256: 4ba71fc47509102716e49b5e5edd8f45fa4d239965f0dee78ca934dcff5ff7ce
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers strongly agree, suggesting a phishing or trojan distribution campaign. The primary attack pattern involves directing users to external resources that likely host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/jtot8bp5h9k0s4lvqc0h38eur6/51007930222.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e30ea950df---wedolokajetopimivaxurireg.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/gipemoded.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b106765118d---jekiribidovot.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/igjdvnu4hh7q0lk4n81qircpp3/gebujegikeleniga.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/99433511243.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/55328ca6414b10c83d312371ca1cc0a9/18355405623.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c3aaaa86---79619758002.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607100ede0f9e---33827128153.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb319e333---30457614927.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072f89bf1419---poginutupemesit.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620476713.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/74v0in1au7jot97t4sebv8d0f1/17455002805.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/rawuwenewafisejifo.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/63416325262.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/11444621738.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/joliwedupavurusufuw.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd4acc96f---94626200568.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba85afeaa9f---panutelenibok.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/bugabe.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/5651573304d02868969b3c03944c450d/59026261932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=3+letter+words+with+y+and+zPDF 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_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 10680 bytes
SHA-256: c09cfd4bb84ec55af4cbc75d38fc9d9ff5bdd2732d23c2a91a1c8ab1286eb458
font_01_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 17808 bytes
SHA-256: 69e05a4442b511e3873428212dcd1cf41ef46c2456ae9f80e550c4fdfacc21f7

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