Malicious PDF — malware analysis report

Static analysis result for SHA-256 874d5d43cb59e092…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 16:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28a27a0020b31a3968544e98486af9ea SHA-1: 39d92a6271540201672d0b562a46dbe7101b92a5 SHA-256: 874d5d43cb59e0925ec420b964ab2578fee0ecbb44610f24bcb1422910743009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4b7686bd327549ba22b4cd4aaa6120e/11483735967.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e61aa89833d---21068886106.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/kowenanaforimovodixit.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/paxaduwelumavizerilo.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/silisafigoxatefojujubugi.pdfIn PDF document text
    • http://sjanzee.nl/file/11782896473.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/murigixulilurumez.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/95892775256.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/11261554644.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c329bad9---belelobakamo.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/24018521698.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046d04fbe8---7668915922.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/wawojifudamibupasi.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/fujelipaniforime.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d97d93b9fa95375649c05f6d20715a2f/lisowemafoziburafisozij.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/71057797657.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/58011268013.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/52989466862.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/gickel2vruj9ljd2pnjudd24k3/71849625547.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f73575a78---7436340793.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/niwesuzekomunixazot.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/digogebozurepib.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38842084a---6082909088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=convert+pdf+to+jpg+without+softwarePDF 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_off0000c3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 11144 bytes
SHA-256: 7f4f02bfcd21032fd7cd8cdddf377cb2399101cb3f0832760ba306424b0cee6b
font_02_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 17264 bytes
SHA-256: 187cdcd97ee6cb64730f95d515d29959f22e613543634f6fbcdb630cc702eb91

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