Malicious PDF — malware analysis report

Static analysis result for SHA-256 34fba1e9a760b76c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-26 22:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd2a00acdd4bd17fc0b6905662bf1424 SHA-1: a9f8f03f048f2fb0d15fd510bfb6ad62c0f879c9 SHA-256: 34fba1e9a760b76c3f32dc495c7073daf92e4fc94e77b8a830e34480250ce0f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the overall structure point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nomylo.ru/uplcv?utm_term=wifi+chat+app+android+source+code
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7a939b619e712c043fda6a939c439aa7/baluzuriged.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2e1c4164---44249581986.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bf4ca97badcf2d063ca0ecd29026107c/88331700392.pdf
    • https://ctcitsupport.com/media/files/6508823101.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41b981719---telapexazejokeruzojuw.pdf
    • https://mbamantra.com/ci/userfiles/files/xabuvojob.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d48e08b43---xikife.pdf
    • http://mawaevents.com/uploads/file/53060558909.pdf
    • https://mimpishio.com/contents/files/liwaduras.pdf
    • http://eakqshop.com/ckfinder/images_store/files/vosojol.pdf
    • http://szcftz.com/upload/vovalakefodumotupasuse.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16142a330d5033---25834611744.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614173f2263fc---75441396434.pdf
    • http://saraya-shop.ru/upload/files/folofekarerowalug.pdf
    • http://balone.net/_upload/file///5341568592.pdf
    • https://hung168.tw/UserFiles/files/34940735369.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h2hej8o1vm2j05bj2346bevcfh/40106847334.pdf
    • http://fixafilm.se/userfiles/file/26890055860.pdf
    • http://jenan.com/ckfinder/userfiles/files/36018978856.pdf
    • http://strahyi.ru/images/file/sodofow.pdf
    • http://webspace.mysdam.net/images/newsletter/files/detidaw.pdf
    • https://casasholidays.com/scgtest/team-explore/uploads/files/37735351646.pdf
    • http://indago-rovigo.it/userfiles/files/26065480698.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/464ec62ac7ffb5ab919587636b54f076/jotoxi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC375 16792 bytes
font_01_sfnt_off0000db87.bin
78ab4605943015b82b388426a223175d1225eeebf21f281ffc355fcd5a989631
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 19412 bytes
font_02_sfnt_off00010e4a.bin
8029669567d3aac895fa1844c6557360cd4814c3a114c1c6e614e90d4d6102c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 10764 bytes