Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3cd03d25db9882…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 08:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e634abde392a5f6243c76fbcea688bff SHA-1: 7bc01b76d2b1068d17be9ff9b3853f43010b4ddf SHA-256: 4e3cd03d25db9882c2646cb955342aa09d4057007c1d60cae0ade8460974a900
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute phishing content or further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160869080f26e5---33199130901.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021053117501019.pdfIn PDF document text
    • https://hoalavender.net/upload/files/33562825006.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-9/20210809201352254608.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efea80b31a4---33956217580.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/pfgp9o0rbri5j1kebihspu0p92/93779129695.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/36662643982.pdfIn PDF document text
    • https://alutat.com/data/file/ledorotarufekakobinagetu.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/61184870351.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f09e9ef34---vupewilogukuvop.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/98724501234.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060103430166.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f488e686d2---pejivoxalakufezov.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/69618335600.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/36255112711.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/bozejiz.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/92439979773.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/75471607986.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1cecc1f1c---kixipujujorajesi.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cb4562b6---xokovaxig.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aa2edf849b9f5d5baed2f43ed5445c4b/resatajoxabeboperawawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=thai+writing+practice+sheets+pdfPDF 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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 18060 bytes
SHA-256: 4b51bc65afbcade1c358175e8cfa5b482e8f3d43a46ada852b9a070e568e3520
font_02_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 10780 bytes
SHA-256: 0ad65644be473cbc8e7d420e275dcba88c935cdf1bca7fefb0d0fa94110d8d9b

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