Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4144325a2cce5d…

MALICIOUS

PDF

97.3 KB Created: 2021-06-03 13:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d39b222d6269e12d6e20d9f7d0e824df SHA-1: f23827791cbc35f943f9ed7c4d5a49fb189385e8 SHA-256: 9c4144325a2cce5d90067054cf541fe2460d555214624564a4ab0e7c4cb5a708
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a payment redirection lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to phishing or malware download pages. The presence of embedded URLs and the 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly indicate a social engineering attack aimed at financial deception.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=the+boy+of+the+three+year+nap+summary PDF link annotation
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/4db245507e616b334880cea22cacf6f6/10918954063.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e5c9a3a287ab94faf7d274a82d83b3ef/77306666014.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/15178869622.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/78b2bb454c09a124307e1be476eedfe5/mexeluvidizibovib.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/78898892657.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ehnauiafvdsgo0qrh1iuqudshc/31296097987.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608484ed4cf8f---7129053765.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/28505639147.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834e77d811---gavulotewa.pdfIn PDF document text
    • https://aedwea.com/upload/foto/tawupulalel.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/90212148681.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/37bfd68068f80917dc1156b220f78c8b/97286066928.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5c45f745c267bd85b4f691f163a7d90a/nenovogiwabosulapoporuza.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/31340110400.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab295c6f833---gawusosogu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/6cbfbeda0be37ea58f2ea89345d780b9/mimexidenutiwotemazamit.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094905a54eb1---48846240702.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 6540 bytes
SHA-256: e1a0f4f8851641b22b9522b78f5a8e0985bb2eacff59a6fc8e30b6225c0a703e
font_01_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 4004 bytes
SHA-256: f5bfe88c42966dec396a654552806e093c47c5d5b5c0239a44b36865af5d3199
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 5300 bytes
SHA-256: 831e339a1c149462e5e62b908871db666177104a490e3290024f8429376f306d
font_03_sfnt_off00013129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 13968 bytes
SHA-256: a7b292ba1abc5b0c0d2cc7be8ec54fd15566fd1bc10bcecb03ef7fbb8d4e1494
font_04_sfnt_off0001606e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606E 16476 bytes
SHA-256: dc57c0f83fd2327f2a5c306a28d6665cd1b6282e71e4667ce14c1e477df649f1

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