Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d58de88ef522f9d…

MALICIOUS

PDF

96.0 KB Created: 2021-07-21 03:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 482767088612d232279be28cb49a30f4 SHA-1: 4618366da2721e8ff78ff941f4ddbe9dd1de69d6 SHA-256: 3d58de88ef522f9d55a019b18e80dde6158f3c0f3aa5d7a0eb09d702f826d175
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to the use of algorithmically generated URLs and link farms to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9672

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/236abb58471b993f6109daacb1375d67/deripusadovapugeduxuvorew.pdf In PDF document text
    • http://fotostudiovaccari.it/userfiles/files/suwowuwatexowasosaso.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87fea6805---39100866803.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/13574935703.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/vozugef.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/84620268328.pdfIn PDF document text
    • https://triosms.com/userfiles/file/31272651958.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b11b0c16e03---nowisesaz.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160843e9e5cf19---21210316511.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/076706f1a71d09cb9e92c8a661296f42/wewazimezekira.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/422506827.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/74762544505.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f4cf1ee8---mawabekavaramureve.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/83282518510.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b934705cfe1---724901627.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1d5049b331e4968228ce4bbcbf841cc9/57954186646.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1db1ed96---kojuwokokupevijev.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7a1ma5b927rdq8hiig5ub41fvk/tarigarasufos.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/29805263029.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/72c188ff46b744294b776a30559f3d91/nijelileda.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/dexowejaponofu.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/46061731454.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0737b45e8ff686cc13eeeb4ccbeb8758/10703331965.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/19503191312.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cf729feec---gipamatotapigujeloregaraj.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/54686404658.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a214ce8d0cf---jogetuwapitogon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=meaning+of+the+word+behemothPDF 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://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_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 10804 bytes
SHA-256: 16ce0e80dee5b811152928f82c0924688cc86a5753482bb978d86683c9c116f1
font_01_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 17168 bytes
SHA-256: 1ac02dd59698d5d5abe2683a9f02dc560cdb7d68f3995dc1009e376b225b1504
font_02_sfnt_off00015c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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