Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39ab119bcab717f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 17:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9b9d05d93701ef0b0c84eef9d8cda06 SHA-1: 9bfbd63d3652dbddf27d4ccda6199da045370c6d SHA-256: d39ab119bcab717f16dc6a82b9ebbf295af01b6903f0c4376a5e47a1625a9b28
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of link farms on disposable hosting. The primary function appears to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

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 https://balticstroy.com/uploads/files/taletef.pdf In PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/82983472787.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/pogewug.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/liraxewajanonogevavufula.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/70574025165.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/buzapuna.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rkshien37dq0pu7ejfhd6e081n/76656787636.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109111422289847.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/11326050518.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109270956009937.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/47475522493.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecf3d7f77---61078863349.pdfIn PDF document text
    • http://partnercable.com/files/jomorenaxuwabopadejul.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/194132806.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/89739280350.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/23593715354.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/29824825279.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/3d0998db9f468d287a4aaaf05afe56c0/kumutufigop.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210912215629.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/jemojoramewifep.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/dawurolegupax.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/gerikojelopifoxetafukub.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/37366339275.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/govijawavigarege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=rupaul%27s+drag+race+season+13+watch+free+onlinePDF 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_off0000b2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E1 15648 bytes
SHA-256: 3ba750ae70f7bf234e513802955129bd0da4071cd1ff2259edfc8765db36f559
font_01_sfnt_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 11388 bytes
SHA-256: 19718b9cdb13ca37e0d20da40f9a0da4de920521cd7b685783ca36d2a571e8b2
font_02_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1