Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5792cd1b37c55d…

MALICIOUS

PDF

94.3 KB Created: 2021-09-08 05:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e365a01bad2be5c921481db537130be7 SHA-1: 617b76559ab4b8c6142ec75a3cba0cecfd31eb67 SHA-256: 1a5792cd1b37c55d62303ecb7994d2d5294b943364ee4a90df55457951a9859d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded URLs strongly indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=lorem+ipsum+pdf+test PDF link annotation
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/68a880e62cfa9a450fb675b3052b2bf7/dodibenakub.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/20870304666.pdfIn PDF document text
    • https://biocoils.com/img/file/19566193784.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/657094lli067d9apthl2r1um8f/jexewob.pdfIn PDF document text
    • http://prestopc.it/upload/file/25872616460.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pujue8pnssrr9ni48rf1599dj2/boxoneta.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/60613114009.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ktqjahl10fcdk0b7lmjheevut3/vemusakop.pdfIn PDF document text
    • http://brukbet.com/user_images/file/suxolefadumupobanip.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/22339d1990bf843290dc7d3659d95cb5/31306936729.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608439bcd86a6---18542570853.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210628142346.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a59ba70a014---kuzubugufodoxe.pdfIn PDF document text
    • https://dacola.com/upload/files/88974167934.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7stco4dldpvv2afg8745ba7ut8/jifuvewafozidoru.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rafgjp27hv3pqr3po15hsk1gng/dujinofefadexa.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610455f6c413c---sawifabizutured.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/25595148765.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8cf89ad83---dakobaladiruzikobemid.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/90738667181.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d554f2d093---buvojapafovujusete.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/lixodi.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/85054425476.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_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 10404 bytes
SHA-256: de5f23fd6a82e5e914e8977299e98f945fa8bb2d03251a12c4a223c453d8fe16
font_01_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 17736 bytes
SHA-256: 79b20ba9751656382d1664c0a8a62fdac56b5d73b6182ae1f2f5a3631ab9d6a4
font_02_sfnt_off00015431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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