Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e91fe07c5a9e87…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 08:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07116736665bd560a9afa48f7d6c63f5 SHA-1: 42bc2c9a97e0affe1bd32bdd4eb5795807c7682b SHA-256: a8e91fe07c5a9e87f6d510a91930834fce6ba4c0251cd76a83518213890f3a32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a817064315---duwabupovamazasimitaritax.pdf In PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/nanaboruriwawijufigep.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883195ed1c0---rizufuzajejilukalajagabi.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/puvubu.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7d0d7c3aeeda63db2c4c7d23d4615219/16504218136.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/89035069170.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb953c9861---1385351565.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070feb7b5387---29723655385.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/46528537340.pdfIn PDF document text
    • http://teknis.it/userfiles/files/83251851950.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/tazitigu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608340837e1bb---vevawamimaxafodutabivana.pdfIn PDF document text
    • http://watch62.ru/files/files/palinadeditus.pdfIn PDF document text
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/895455633.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dffa515e7---73089514604.pdfIn PDF document text
    • http://bakoca.hu/files/file/91198898613.pdfIn PDF document text
    • http://uco-kampen.com/media/files/32084871421.pdfIn PDF document text
    • https://fuoriscena.eu/file/99081780697.pdfIn PDF document text
    • http://ingore.cn/upload/files/susufufonoradajisudofalem.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42193f737---47766393461.pdfIn PDF document text
    • http://ashioke.com/images/library/File/zikojutidoruxubesesud.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/84427093294.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/suvivufim.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/zigojonixariwixi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/rilovarusizeretuwex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gp+rating+to+deck+officerPDF 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_off0000e734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 10712 bytes
SHA-256: a15683f501248fe5e289b0c61d9bf73fa5a43bbfd573789b1d1ccde5af10cbb6
font_01_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 17932 bytes
SHA-256: 1d99e44d814506ef55e436d80382d693d7cb6e1be94c5482d1e50ad4d3e922a6
font_02_sfnt_off00012e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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