Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e457749c7c665c3…

MALICIOUS

PDF

90.2 KB Created: 2021-09-04 21:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd944952e42f190c65029e3e9f3722c4 SHA-1: 22aabc8814bb23e13438d5aeeb861fa95c83649b SHA-256: 2e457749c7c665c3ae68defa2c3701163b29f43edbbf914da744ec2e4fedf158
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=accelerated+linux+core+dump+analysis+pdf
    • https://mgs-on-track.com/uploads/misc/files/wapukaxolanefirate.pdf
    • http://architettorobertafasola.eu/userfiles/files/99991477669.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/61375921419.pdf
    • http://arslanemlak.com/E/file/71894642717.pdf
    • http://analogsys.com/uploaded/file/213416322560fd8a26704f9.pdf
    • http://zzfcw.com/file/fkimg/file/xepilobonigumaziwurifovuk.pdf
    • http://healingtown.org/userData/board/file/29102104094.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/123bf48899b3076e0d171192e144bb51/77637784104.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739510cf0ae---10284566024.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607371934656f---43014064969.pdf
    • http://architects-desk.com/uploadsfile/duwugenimisepode.pdf
    • http://marjoleintje.nl/include/userfiles/33131731690.pdf
    • https://marblobaths.ph/app/webroot/img/files/28686667880.pdf
    • http://araonline.hu/uploads/file/buripumutivujewuxejen.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/070ee32d8079efdf70e9371b3570838c/1139397909.pdf
    • http://jimigubellifoundation.org/clients/f/f9/f96c94eea877db95ad0a8b6fd709b1ed/File/somosegevuloni.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f992a219aaedf55198efce0be3d19115/7218560723.pdf
    • http://abwjefferson.com/uploads/files/maxuputapubifud.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/lewuluvejexo.pdf
    • http://bobas24.pl/Upload/file/lalolukibizibinoxufoki.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6408d954---nurafipijome.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f60244c4---fekovawalobigisakudazofob.pdf
    • http://moscow-vernisage.com/files/files/54250171908.pdf
    • http://quaint-house.com/images/blog//file/niferuwijenofemefukute.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9cdcac1a4---tuwepawijavekofaxedor.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dc2ab73ff---42087651325.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_off0000f967.bin
4eed49fe959a7dcf66b82460bd67b5e97e5e4785a5a7d9ba727b6c48568b8168
pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 11080 bytes
font_01_sfnt_off00011341.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 16792 bytes
font_02_sfnt_off00012b53.bin
60587debf091f8c4d87a65ee8a094d0d6c455f11d51e1bc8aa2757525345776c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 18460 bytes