Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef07d0725f1457d…

MALICIOUS

PDF

93.5 KB Created: 2021-06-29 04:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f9981777c028a064717976eab60d27f0 SHA-1: a1375cad723fbffb7c902a38b0aed458b51b42a5 SHA-256: fef07d0725f1457db26bc6d39e21d2a5fa12cd6f74af8eda1f423ff2151c9f6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://medvor.ru/uplcv?utm_term=mechanical+properties+of+solids+pdf PDF link annotation
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/41198531789.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3130962f---98608686922.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/pisavufowovapomopetomut.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f16032c08---buwugupetex.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/64c2bad80d4923c2656a072ffa9bd1b7/73156741913.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cbd9006abc8a32473c93960578dcda1a/63915462297.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/69756847712.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802c5a25475---70456325725.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c50c6ecde---65703348102.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4085d5f05---lelosokokorasotesi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6bf4e731---53842300468.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/63959272728.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607214fb4c84e---24468382215.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/6476635558.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a273b1aa3ad---depurozovasalofetenab.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78cd5d416c---91735722103.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/f3f39847fa3402f8c89981b79227832b/82667610789.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/satisunokesazo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608275f713ee6---majupoxazipiforo.pdfIn PDF document text
    • http://vinmexindia.com/uploads/gixiwokugoduvat.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/zijovowe.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/10090384942.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/53mrc9gk6hih33c4tj3jnkaoj9/91135560774.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/94863672926.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 18828 bytes
SHA-256: 9521c43ebfc195fadee15a4c21211c8684cefbf18cd8e42c8f5b5d015c0bf65e
font_01_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A43 10708 bytes
SHA-256: a1c15ec505bee971311b2eccb34f2483e04c4b670b70fe62585084879261f792
font_03_sfnt_off000152bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BC 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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