Malicious PDF — malware analysis report

Static analysis result for SHA-256 542c7d8101bf6128…

MALICIOUS

PDF

87.0 KB Created: 2021-09-18 06:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41c145d6e287e0ac4de1468f88f1d00a SHA-1: 856497b04351a153d1a89b8d22e5f59038af4367 SHA-256: 542c7d8101bf6128aab5f548989b243816c9cf346c2b1c9e13c15114b77cf01c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=electron+js+android+app PDF link annotation
    • https://panama4d.com/contents/files/24395503804.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/resapejobivetekimu.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/vanaxavudovenogid.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/833ffca71dce8573c7b4f7bdbf0b73c9/97444899589.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/jepolabobolawumomefuf.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141766f29ef4---29213709.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/javevulagokaxavuteto.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/69558038649.pdfIn PDF document text
    • https://coevent.ru/upload/files/81786188809.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/rekepajutigijukajigufuje.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kilinaz.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/dopupibukawof.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/9cace0548151039f558e7df1d020645d/66688002016.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/botojipabofokudum.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/18018119438.pdfIn PDF document text
    • http://vit-physio.de/file/11214013901.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/lufomilijilad.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/zubazofeleneselipemumar.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/17701149715.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/88527373583.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109051555248968.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/redatafipofa.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/pedafelatoxivezal.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_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 10620 bytes
SHA-256: 46c8e1c2a9f07a409cc9b6b19dd02d13c5c3678280eb4d58e555323a562f8b5c
font_02_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 17624 bytes
SHA-256: 05146acd24c485c0f793e73da91780fd8e8125d79eafaf27cf2382f57f008ada