Malicious PDF — malware analysis report

Static analysis result for SHA-256 7845388da4810f9e…

MALICIOUS

PDF

83.2 KB Created: 2021-06-26 10:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b33ff79c86e1778de5415f6f31e4c552 SHA-1: 225f7717965bdce9ba41f64bba04318e35e2101f SHA-256: 7845388da4810f9e2e1e37951922d65092a5f21fa86d3d5ebff4d475748a0da7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=how+is+connotation+different+from+denotation PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c5c9025784f5855799ee98e639355b92/53164032138.pdfIn PDF document text
    • http://herve-coiffure.ci/files/97409281535.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/18475996498.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/27507853977.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/sulusop.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608769b975260---6037136256.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3c38797c6d2990a8ce39f6b3882d1d0d/64180809566.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/sudesixumagodij.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/23502873626.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/60857367769.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/35361285944.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/92761486490.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba745d3025b---wagisofuvefagunufuv.pdfIn PDF document text
    • https://motacademy.it/file/zikinokuxinopoto.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/kexojageberukebu.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/81002496501.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/95658202498.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/26750674931.pdfIn PDF document text
    • https://cncunse.com/d/files/zudodulunakurek.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160765c024b8a5---57478311224.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/lesudexurix.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83bf7bda6---movilapi.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/fuwukebosabivedowimig.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_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 16960 bytes
SHA-256: d50baac5de1ad710f8d8894232f9e9615924b05d61c21fa8b090d126195b9ca3
font_01_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001277e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 10668 bytes
SHA-256: c4ed52a6589e87491f7e23b202be3b47a0d429a123e7d73345b09703e95ce684