Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee60e72ca80d555b…

MALICIOUS

PDF

68.4 KB Created: 2021-06-04 21:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8aab5f60ccf40b1fb028b155f34aa511 SHA-1: c4961f39cfb58c76188fa6d83507ff46b5b8cffd SHA-256: ee60e72ca80d555b997e60caa28ac9359ec9f3eed64cbb7339723b3a9c4e2adf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=how+to+use+clock_gettime+in+c
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/sumobaj.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608101ebe9306---59139794492.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f9bc08841d30529915a2b3558f288968/36664419963.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086e21b26f09---pomexowamo.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608707dcabfaa---tefefesiragimuko.pdf
    • https://pet-fashion.ro/mm/file/59414660239.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9ejgshouupbor6sj18nij3ekdm/zegekuwa.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af8005a0c80---93980226701.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a0008509a1a---15299711182.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ccafe6cea35ba30f9b3969df5f070081/pudifogexelat.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e0571d5d10aca7d00cbb29adb4c920a4/904354727.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609249953889d---zenaruligoledekugeji.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/05232be929391f495818651396a7bc65/40918022614.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a858a2d4d46---84546649737.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6473993ba---43562518665.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6b269d46---galalapadixikile.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606de27374983---43974579677.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/faf1980ef0cabd1de524dd5f80dd8257/javagem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c314.bin
7e2b379190b57ba81b4b28f76a059aa532b6ba570ab613631a80296024a2865c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 4840 bytes
font_01_sfnt_off0000d39a.bin
c5a465a4e7550957811ff220361ff3a70fe162a71e64293a33e80bc4f73eaef5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD39A 10160 bytes
font_02_sfnt_off0000f672.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 4324 bytes