Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60fe1d1b25ef286…

MALICIOUS

PDF

97.0 KB Created: 2021-07-23 06:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 27266a4a517f19b869d674fa3e54b4d7 SHA-1: 41b1f975d0b5262010e0d34a5cfa2cf672512240 SHA-256: f60fe1d1b25ef286c1c61ac92a309f0b1a05ced39c4b401aaf49e1fa1d4da8ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external URLs indicates a likely attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://constantemail.com/userfiles/file/16261837751433689521.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160932fcf5ce33---88235532681.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/sefipunowiwevixuwulidoji.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/46956216186.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/a668ml2u9i7qrd42618clsbj4c/kebijebesul.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cc1f4ac9c---tiruxanovawemumenufa.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fb5c30c06---94681049654.pdfIn PDF document text
    • https://serka.com/serka/upload/files/93731522472.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/6c8fd623ee6a58da17e97cd2f3c29a25/26576255384.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f7ja5n9ebmgbb4gu08f10caj72/sotun.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8715389f3e6b06c245ec3845be9f74cf/62939340849.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608245cff22f0---54050226780.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618234fcdb---14801729127.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/04a24da3410a735d73e53f266e856c17/95986314358.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f10c94db---740274718.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c7d7e9148b29fe37f490d315da9d1ce6/gakuzipov.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/93081533749.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/721b0a999c0b6c789741cd29d0dc81cb/3290984316.pdfIn PDF document text
    • https://motacademy.it/file/91845649824.pdfIn PDF document text
    • http://dnepropress.net/files/file/17362651869.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac69969c78e---defujorogani.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/31240752303.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210627024223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=point+and+figure+chart+patterns+pdfPDF 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_off0001170e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170E 17164 bytes
SHA-256: 291fe163c49cb35243465bb2ae0c9f446a428157fc2ae7fdabecb7094cf9be92
font_01_sfnt_off00014419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14419 10956 bytes
SHA-256: f4f2d42f8731c73334eb2fd1cc10b7b3e8c565592db1ff1b9f3edd84d8b4fdda
font_02_sfnt_off00015d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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