Malicious PDF — malware analysis report

Static analysis result for SHA-256 977af014ce446428…

MALICIOUS

PDF

83.4 KB Created: 2021-08-20 15:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ed79255a8b22e7b7c864bbf904908f5 SHA-1: 9703b6d587f64f3de3985509ae7578ba8b9fee46 SHA-256: 977af014ce446428241258b6d1420fb9b36ec0bf262722c4e9c9774647bed61a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to disposable hosting or compromised WordPress sites, suggesting a phishing or redirection scheme. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://classicalgardenstatues.com/uplds/file/72030619299.pdf
    • http://joyearland.com/ckfinder/userfiles/files/70908054188.pdf
    • https://pakistanchristiancongress.org/userfiles/file/40075848587.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/dfa8a39d36c5955f98d51007a2ca4cd6/doreku.pdf
    • http://dcbestwings.com/uploads/files/letasidavupiparuva.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092be171c91e---gavuvomofomatunoru.pdf
    • https://navliecky.net/userfiles/file/gumofefabexugasulug.pdf
    • http://melly-incendie.fr/img_db/raviguxunaxi.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16099b81dc9621---31849172217.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5fc74c0bfe9ff78296cfd1c5cea95460/12933274650.pdf
    • http://haciogullari.com/depo/sayfaresim/file/mukuputozixabima.pdf
    • http://whitedwarf.ru/public/images/ckfinder/files/jixosununitoxoma.pdf
    • http://ymmicro.com/files/files/zabidezolasep.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a47f0a0cd---zuralerotowelitu.pdf
    • http://diegogenna.it/userfiles/files/saxirije.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9ciptasup9mg6hrol63gjo5emi/xutuxaxowo.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/12651178875.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c19a92f3ba---jowezugi.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f4850bedc---98124221166.pdf
    • http://geyikkimya.com/userfiles/upload/file/44584880264.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5kgjq3l3lauena5s9dqk5vfd30/42753572811.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec43976f0d9---gajonanipepusipebabexud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=konoha+wants+naruto+back+fanfiction+rinnegan
    • 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_off0000ddd7.bin
96ea04c10ec81c2e9c3118ac56f162adb20e1d367088dbf638c226b4d947f8be
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 19100 bytes
font_01_sfnt_off00010c90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 16792 bytes
font_02_sfnt_off000124a7.bin
dd4e47e5c80f3a13f9b892316c3c5ec86f1ce9dc717e0d84c95876c887ecf813
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 10976 bytes