Malicious PDF — malware analysis report

Static analysis result for SHA-256 0498b8746ccf777f…

MALICIOUS

PDF

96.4 KB Created: 2021-07-21 03:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f183369e26b090fe6684e6c25d7a80d SHA-1: 703e42ca996fd16f75ac9bb3fc01e3a674c35569 SHA-256: 0498b8746ccf777fb40f6175b1f2860e73cec7fd26c273562bf5885e105d6748
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and link farms suggests a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://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_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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