Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9ed23db90bce59…

MALICIOUS

PDF

74.1 KB Created: 2021-09-28 18:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a699a7d4a2a9ecc5fe2af95a18108ba8 SHA-1: f631fb8d0e1f7c9355faa73edf3836123d4d1be7 SHA-256: de9ed23db90bce5938a50437d9e51a1cc8faf6377d29117e48fb3df929ed5f92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of external URI links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=fifa+14+android+apk+download
    • https://nicklason.se/ckfinder/userfiles/files/25090011036.pdf
    • http://normel.org/files/upload/file/29607215814.pdf
    • http://gaia-onlus.org/userfiles/file/gezevutilomuvivuj.pdf
    • http://lasantitosrestaurant.com/userfiles/file/lalafibo.pdf
    • https://escaletravel.com/userfiles/files/renusojozajix.pdf
    • http://ersenergy.com/UserFiles/file/xarerazomomoxokotitovox.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/nepovavetijipusitonatuna.pdf
    • http://dopuskvsro.ru/UserFiles/xagujuzarunad.pdf
    • https://rainbowprinter.com/app/webroot/files/file/35489565571.pdf
    • http://2m-m.eu/userfiles/files/lesumiwofis.pdf
    • http://mpti.ru/userfiles/file/pomelubudopalibugupuwu.pdf
    • http://hyunshin.net/userfiles/file/lexojagedopexiligatew.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pn6pctocbql5gspq6e4lleufbc/sezonomodukepipagoru.pdf
    • https://galerie-louise.be/userfiles/files/jimozonogixomu.pdf
    • https://stillwaiting.org/userfiles/file/dogugerapixumenajadafex.pdf
    • http://ekbdrive.ru/ckfinder/userfiles/files/juvobad.pdf
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/tenosekofe.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f115cce3610fcd30b9c64ac89a1ad2f1/98435806796.pdf
    • http://ensky-chemical.com/upload/files/waretunudogifuzijozepuro.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/58397168987.pdf
    • http://hophungvietnam.com/app/webroot/uploads/files/vesexevasamuwatoduzi.pdf
    • https://ctapigroup3.com/contents/files/22664591162.pdf
    • http://autoscuolavalerio.it/userfiles/files/90493442883.pdf
    • https://natanashoes.com/kingkong/userfiles/files/regiro.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1976a2594f015f639b0d6979b23b99ab/9591647471.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_off0000b9fc.bin
ce5951d72a1de49a9539a130f02dd3587ae26616e9cb0cd0a188b23d8fd89127
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FC 18836 bytes
font_01_sfnt_off0000eb1a.bin
3950ee3e2f438b1b2401cca9e0edb56fca9dd3b5c1b1939375876d6254fc69bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 10380 bytes
font_02_sfnt_off000102b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 16792 bytes