Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5443ddb02a85260…

MALICIOUS

PDF

84.6 KB Created: 2021-08-16 16:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86b7c9059718b9e5114b842893097852 SHA-1: df49adeff9cb08c31dd9fe95249cb780158ffd9c SHA-256: c5443ddb02a85260f0e5fbcc9ea6ea88e4cabe14f39291b15fb15073fa44e24e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://wastran.ru/uplcv?utm_term=convert+radians+to+degrees+worksheet+pdf PDF link annotation
    • https://restavracia02.com/userfiles/file/fivusorizimufotikabal.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/tevikiw.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8143a245b---mazamob.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/94651088133.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae35bf325f---92264914045.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/74423204099.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/82033239177.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/61386537317.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vonit.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bc2337da70e244b1b5135ffb6180808d/sifoselusosuxojorikizejom.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/jarisuwikaz.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/pidalolavexatedolugu.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/visame.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/62739306737.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/99960222781.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/90vf9f8nd38r396aeatqi703n1/judoxakelekadipufezetejir.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/96959023642.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/sekuro.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/wolemujubafamava.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f72e6611---rabomeke.pdfIn PDF document text
    • 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_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 11004 bytes
SHA-256: 2ce6941a4601beb6fad079f5533f88d4e7ee4b36615f43aeeb5926b7585dc202
font_03_sfnt_off000117b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B2 16904 bytes
SHA-256: ad9893e6df37e4ce77009be99c3f3920797ccebdec38136725a490642212d42d

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