Malicious PDF — malware analysis report

Static analysis result for SHA-256 532f47dd039f3868…

MALICIOUS

PDF

86.6 KB Created: 2021-07-21 16:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 285c3b6cf03b64d98d9df7514dd476c5 SHA-1: 2861395d10927087c47a3041d5393ae291180e67 SHA-256: 532f47dd039f3868d13cf06ad6681a9ba95fa85a20308dc142534a52a16bb57d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e507bc74dac---gimokivagepalimoj.pdf In PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/murepedulonobovikeki.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9fc9e6c639f037fcac3221a81a6e9ea3/65700555273.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/joputofavozokotukov.pdfIn PDF document text
    • http://www.bash.cl/media/file/milabinozolap.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/98290834092.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/92227520349.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d66c456c973df6a24bfe6d8b367532fa/50425495620.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609e838e64a73---64280101338.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/12386127296.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsl25rf654pm155mh6mhghu0r5/1634846484.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/19751100850.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5f9dd6772---11373029975.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/85611f375c4f3ad5605cad7a9b5066bc/daxepumus.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608106640804f---75579530614.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/rimulu.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/xefatakogaketuwar.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/069333b028d0745e9e4643f3fa94a572/51198315029.pdfIn PDF document text
    • https://purefeeling8.com/data/file/mofedolipojawir.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d470d3d876---37986422277.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896d475188---86367805202.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xosudabowezowafa.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/64236782961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ls+dyna+dampingPDF 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_off0000beeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEB 17680 bytes
SHA-256: 10c7bf15407bc8feb50d70ee6ea68567f696b4bfb55882d44a692707fba63bbb
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 10312 bytes
SHA-256: d41e1ca642feb249af01c98850a64151b432cc5b6d5558b50dc4a2ed2ceea723
font_03_sfnt_off00012268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 15824 bytes
SHA-256: b968e8372ee9a87e2dd191d2759b2153908cf34c5869f3c1883709459ee0afd5

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