Malicious PDF — malware analysis report

Static analysis result for SHA-256 f079ac60e7157731…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 22:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ffd922497c326287a39075a1703ee7e SHA-1: 45f6848943ddb7ce00135b7921ef679ffe56e9c3 SHA-256: f079ac60e7157731d0d7d0e144c5f2430b0f3b77c9e1232232b98430e1a8726f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised websites and domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=best+dog+breed+for+beginners PDF link annotation
    • http://timebymtm.com/upload/files/jegedexuk.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610116de6458c---gawixenenanelegimorejo.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/nomakiziriro.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/16356890310.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/72749328602.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd74d0d240b---fisogizogazusiwok.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/xedoge.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/588f2414fcb7c4cc6249397a920f0b50/titekulolovel.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/dedebizidimotepovesuluj.pdfIn PDF document text
    • https://airbays.com/userfiles/file/18013325239.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/72700801122.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/mezamipakesonuwomuse.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/25496625216.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/gifibuxam.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/gumulowinopid.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/b2d4649722154b23db6ee760f26450f3/zoxifiloviz.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160d789125c731---49173975478.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/bowurowuzajisovedixaxopaf.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/fofenaziruwudijunasu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f08c45a9aa9---51943547472.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/22766504381.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 10516 bytes
SHA-256: f0f9ce8ed6763c9fb9a18679b000256c92b74d53414061a7cb517c800f49027e
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 17460 bytes
SHA-256: 04834ed3fcebd4f714a599b6f9b5db9bd81b1cef817d58d22b7e961ff7b692ab