Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d25bea1a876288…

MALICIOUS

PDF

97.7 KB Created: 2021-08-07 14:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f1ee083b461b2e996a6b8f46669c5cd SHA-1: 90fbbc6fca1864a5b460a13b03c5e2d27c4c4289 SHA-256: 71d25bea1a8762888689134040dbab929f1fa8392a80092d0ebcce244285ba48
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded links point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0ff39f234---67335507729.pdf In PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210630_231030.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/konamix.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/7984432443.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/rosafeximoxiwalib.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca1dc27b8---23523965103.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/firetobelakawagovena.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/60098456202.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/242cafc722020f73eb81d28ef7ed6432/xafaxuvupemola.pdfIn PDF document text
    • http://muszempilla.com/files/file/18586562074.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b277288204a---27385851917.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2adc32c2e6b89c8fee9a6546cb799dc3/wijopuvalozijatosul.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/dd37d2fd27238dcaf404a8906adfe977/48401025570.pdfIn PDF document text
    • http://distributoram.com/files/file/rarigagukinixunozikuvim.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcada5a66d---zalikakuwusox.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad2327fd99---puberujit.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/3178c15c0439e841968722060dbd3e26/34510271394.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b614f171e93c40fb8f7c3467ed322c94/zufoduzurisekibeki.pdfIn PDF document text
    • http://dentali.cz/files/files/kotisuxedupekegope.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90111777195.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/p1tq3dngqao8cfa0hi2703v60m/405425054.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa32eccbfa---65469431427.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ba04f0fe8---xuwepuzojet.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/54459049274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=comment+draguer+une+femme+dans+la+rue+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_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 18948 bytes
SHA-256: e14e72eaf39e9850c050e1c743c13a1ba085b43c43bfa95c0cbd96b5932abdcf
font_01_sfnt_off0001459e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459E 10880 bytes
SHA-256: 481b940ba6d6bce6c81d0118a0365cff8ff34be6454d20f20c6acae3ce4d1856
font_02_sfnt_off00015e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1