Malicious PDF — malware analysis report

Static analysis result for SHA-256 875d5d9676c5c7d1…

MALICIOUS

PDF

98.4 KB Created: 2021-09-01 13:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: df8e6a8c6439f134274b290efb82b2ef SHA-1: 5b051dd2ab418d7c5aa9ca491f2086641d2c0991 SHA-256: 875d5d9676c5c7d15880212f1b63bd8d6d1a60d3e5a7d4aaa21a32f4abc69456
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a359d989---25712000415.pdf In PDF document text
    • http://lineshare.net/upload/files/20210821051651.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b5f72ee489508f24396fb1ded0c08b6f/66863864531.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1610604ce63c18---porexibipomukif.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/lojujoziwigu.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/99440280388.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/zoratitedelat.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45840da31a---92843456093.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/natutelot.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/63191586039.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/retuwipo.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/butuzufomosefebun.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4772534a09---sijuvowolidajidisegomef.pdfIn PDF document text
    • http://capital96.com/userfiles/file/74436256450.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/somemuvodevipag.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7507254e27---71410515293.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3c7f3cd331698420eb33d720beaa3914/topavo.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/99659511623.pdfIn PDF document text
    • http://df-2.de/images/daten/file/nudad.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/kiq89idl86e8g9nb6q8fioher0/budetibunesotiviwub.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/83551519428.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cd484f2dd8e2e79aaeb1dc644f10e756/gimowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=march+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000106bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x106BF 18892 bytes
SHA-256: 5085fc18c48d853b53b86b6b55c616450276c41d49a4244d5ea63e170d6bc06d
font_00_sfnt_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 10284 bytes
SHA-256: d971fae9a869a8ff0b7bbe9c19b9015934b0e7a52bd694123fcc28e9a35f2859
font_02_sfnt_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 23092 bytes
SHA-256: 64f09a093ae26f0c1a060737ff4af8cb1eb78630552c504bca5040af3b4f2f05
font_03_sfnt_off000161a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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