Malicious PDF — malware analysis report

Static analysis result for SHA-256 555a16d08ab8c709…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 08:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff5aea03315a7151275200ec0a3732c0 SHA-1: 1c33affe68239ec53c6e01c3ef1fa4171a7f5c76 SHA-256: 555a16d08ab8c709c9931884228ec9bef80076d22325281f915c79225498c206
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 or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://universal4shipping.net/userfiles/file/53959962342.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/josarogaruzodozug.pdf
    • https://toppelletmachine.com/d/files/monuxowonitebojux.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a41022916---36249296458.pdf
    • http://faurerom.com/userfiles/file/14364545813.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/fanarif.pdf
    • http://quimis.net/js/ckfinder/userfiles/files/jigozuxopototima.pdf
    • http://banghetretruc.com/media/ftp/file/89512064474.pdf
    • https://rabudiagnostic.com/userfiles/files/39198750944.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/19c96587a277c5483efb38e327b269a1/77224113663.pdf
    • http://tw-tms.com/uploadpic/xw/files/vejigixufido.pdf
    • http://thsport.dk/userfiles/file/45611500103.pdf
    • http://vitalbafitnessclub.eu/userfiles/files/ximetigidudekesenam.pdf
    • http://marmaraisg.com/images_upload/files/jitogigezorejifo.pdf
    • https://yodishit.com/uploads/userfiles/file/11982163309.pdf
    • https://suacuachuyennghiep.com/uploads/files/33399751936.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e14d1cdc9---lizomubakaruzeji.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e6197dde7d9cd6bc986f09ce72094dea/7320940331.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/guzupitoka.pdf
    • http://leicesterbiketec.com/userfiles/file/88288481439.pdf
    • http://artattack-concerts.de/files/file/jalisajabok.pdf
    • http://dolphinegypt.net/userfiles/file/walajexikomosetigoxamij.pdf
    • https://doxity.ro/ckfinder/userfiles/files/13061921360.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08461df8a---ripubixevu.pdf
    • http://xenangheli.vn/public/files/gesumokixemefejaxivinore.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ea+sports+apk
    • 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_off0000db47.bin
8c6d8ae0db609e0025b83b049912c5f4f4200a68e7993e51c046154a9e274180
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 9948 bytes
font_01_sfnt_off0000f171.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 16792 bytes
font_02_sfnt_off00010983.bin
386fe1f97e75a2225f2f1bd4122132600f50d6c9694be39baccd2384c4cd7e3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 19248 bytes