Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97c093ad868114a…

MALICIOUS

PDF

94.2 KB Created: 2021-07-13 18:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c1600d1921dfdf4d1c68d2765f79810 SHA-1: 2b9f6ea066889ba84d1fdeb4e56db344cc1f1062 SHA-256: b97c093ad868114a8af18b8b795106e03e602a5e4eee3edf74ae0935d9d2b4e7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The file's structure and the presence of external links strongly suggest it is used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://inwebjor.ru/uplcv?utm_term=use+of+monochromator+in+spectrophotometer
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03fa7aeec---82912952292.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/daaa81135f3de9c3d0d10d24d68f0bff/22995936580.pdf
    • http://aimic.com/userfiles/file/nutim.pdf
    • https://t2sc.me/userfiles/3090141980.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6baaba1ad---rinaxepowikavofofoje.pdf
    • http://vdavloeren.be/userfiles/files/27023822211.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/55i0ofdtand9l6eg8nnsob80u1/98126489052.pdf
    • http://paoladebenedetti.eu/userfiles/files/90875069683.pdf
    • http://traiteur-ribot.fr/userfiles/file/wupirutesezovodef.pdf
    • http://dent-pro.cz/pic/file/taxokowuporexajuxukirulob.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/pekiritegufizoz.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/668f9e761b588f265739bbadf7d3433e/jejixibonifomebositatomo.pdf
    • http://asijskepotraviny.cz/files/file/jeranad.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/jexevefumijulewikos.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f6964acd12d5baa3292bc9901d776958/kavimalusemogizanapagiga.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/68266988914.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da68020210a---ziwilujopiziwenamuleporax.pdf
    • https://diaochue.vn/userfiles/file/89258005934.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091676adb19e---xobone.pdf
    • https://candica.pl/ckfinder/userfiles/files/55816821723.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/274753b08d807a22bfe1365bc7617d19/43816910190.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e556925dd---mupeladawizotezinimokor.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8379617b0b---13695814868.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6de4abe3e9b575bba5cd0632c61621bd/13498981285.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_off00010976.bin
2b373003f39283ee72bbe27dc281b07bd12239ab92bb2a94b53ba4e09a1d7517
pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 10708 bytes
font_01_sfnt_off000121dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 16792 bytes
font_02_sfnt_off000139ef.bin
8a85dced6ee996518ae22baf8469e19fbea0b0932e429c5dd72bca168a3e6a77
pdf-font-stream PDF embedded font (sfnt) at offset 0x139EF 18224 bytes