Malicious PDF — malware analysis report

Static analysis result for SHA-256 42355019dd048b9e…

MALICIOUS

PDF

98.3 KB Created: 2021-07-17 18:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21321c10f2f2bc08003caa826d24b7fb SHA-1: ea2771e5028f33d89aecd4ce4b50420a30284230 SHA-256: 42355019dd048b9ece707befd37ff01ffa3e7a740a260db2401b5f83b764b060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are consistent with a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://costruzionibulagna.it/userfiles/files/66988525267.pdf In PDF document text
    • https://tepihtrava.rs//files/nuseminexozovufufugarefup.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/8453263837.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ab3be8cc---zunitufula.pdfIn PDF document text
    • http://elskenecologie.nl/files/bijunaxuw.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/76be395e1bf13b50be6c830a20ea957b/94697907875.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/95176386212.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607142e75cbba---23774401940.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/26759980716.pdfIn PDF document text
    • http://proxima-design.cz/files/file/febadopasaruwe.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7709bf0760---fepibo.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/12603990902.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/3f600d4136a36691e0394d54ffac471e/noxuse.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/98473697540.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf16855e6a0---76907045951.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/862ac5fd1342ca49d4631dac9fa36efa/24692894165.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/31dbe46f731ce9a3675811e9dbb8c63e/67808714758.pdfIn PDF document text
    • http://faradbox.pl/files/file/junanajumosazasejuk.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cfe9866f5c45e25e345172543fa3207b/80745494376.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe1edc508470cfbd527363075cdef44b/73630551701.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56fb573a5---68381654898.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/22703783453.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/23afb89a227071914c1dbe83bba9a513/jokifejokazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=promote+team+effectiveness+answersPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f2aa0ce8c2736c4507408c18078cbdd8/89726736451.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_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 17328 bytes
SHA-256: 596ff6b3f3f8e5a59c43833a3ad5ca67debd62995364b9ae3d083cc46f6aa0d6
font_01_sfnt_off00014b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B75 10604 bytes
SHA-256: 064d20682e232c9adee3d5fc204e581ab3e56a7ff1e8554dc2faf41f9597919a
font_02_sfnt_off000163c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1