Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34778491404b91c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 11:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1269cbbc1f88ce1c354486239b5ebeb SHA-1: 5ed25b9d99b7800bd0c690814313e30faff150ca SHA-256: d34778491404b91c6c5273f41bddc7c6ff762f9a5c8c453898fcb3ba55bfa60a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614deae2223bb---6483863019.pdf In PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210919160639.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/lpu68cfg3gs1oierfge5cum53t/pomujijinewupajibim.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac798e439a---kuzufedatujobubopovonomu.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/papopezofetedifa.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/lulonekizozalaxexukej.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/vifalajutizu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614271173878e---31916718287.pdfIn PDF document text
    • https://telenovella-bg.com/files/defejidaruras.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/folebapefarup.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/dizaxanovifirifiw.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/zerexezotijilosalobeguje.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/bisix.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/63803177621.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/62368467451.pdfIn PDF document text
    • http://dr-temt.ru/images/file/47991340120.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/kuwefinojisese.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/63422414745.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/7124747148.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/wexikoxoputitogadoxupote.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/fobuxenek.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/niwazifovogugurapad.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/28763512082.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021092110203928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sketch+photo+apkPDF 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_off0000af91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A3 15884 bytes
SHA-256: 9a834c7f0b8938b60b0df7d175c9943d8b25415774dfc2f0a0308ef8f3b3a970
font_02_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 10128 bytes
SHA-256: 69a1ea1c10bf59d035654f341c416f06cbb23af0e1558d52efb7c6968b7a06b5

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