Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed6cab2c4dcae04…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 15:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 671e9629b742c254f9e11deb2de9073f SHA-1: e7989cf75bdd56ff92e1e6c01d87594916d25abf SHA-256: 4ed6cab2c4dcae04978753d528d972c4c195eeaefb4944a5d141cec816391632
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://wajl.net/img/file/20219343025.pdf In PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/wejudexofunulerilugelava.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109030212037469.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/53589466115.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/todirabojimalovatawewole.pdfIn PDF document text
    • http://webursitet.org/Files/file/94521408896.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/zaritazajatubinepisalivum.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/tusafasarogimakawod.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/34112499486.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/bifelofezuwabaxufevexuves.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/soneb.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jepotezaza.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/24706644580.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/denoviwez.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/fajeturejaguruj.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v3tg8l98oj83l0qfdmdamvcfai/vupikiwodizejog.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bb4064313ac16c0d4f03b86037fa1a09/42004183020.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/50457801222.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/45012817471.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/rubetoxuxi.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/2455228929.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/46918378125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=smart+unlock+androidPDF link annotation
    • 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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 10496 bytes
SHA-256: 7463fb58a0ed2ef5c240a868522099bde9c954f30e7bcd9c6f17bc9f515d8576
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 17552 bytes
SHA-256: 1314c446927886c6d24d7188071e7568279e1f24ffade14c764f3d451b3db1fa
font_02_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1