Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dfc66b31a8832f…

MALICIOUS

PDF

85.9 KB Created: 2021-07-07 21:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db85aa3530a9ddf8e69f1a49f46c0815 SHA-1: 0eeb798bf68b4745eac8176ae76eb5a7e19b5c75 SHA-256: 82dfc66b31a8832f34b2123a633f62d937ba2f4daa40d36dda61064554406918
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://baovephuongtroi.com/vietkiendo/upload/file/74191740599.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/57002180597.pdf
    • http://i-harmonics.com/upload/files/9803652777.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rcblhlsomeg46rpabkb5euur1o/sekitusazomajodudatof.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2fb1ui2g23o999q1r8412du18p/79946516105.pdf
    • https://aawyx.com/sites/default/imageuser/file/95937208810.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b036335242d---gobisug.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1mr2a9n2r8iul1tn9hd2d7mcl0/wurexixavikat.pdf
    • http://magooferta.pl/uploads/fck/file/revesodo.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e43da01761---sumugakivitesekobuniwobi.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2dcc4786d---24752606497.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d8ac959ea03c3b90b08806caa93c466a/nuvuzalinudonitapasazulu.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3et922g4djilhi9lp4u77df9us/64448068016.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5019be5d18---80668049774.pdf
    • http://coytex.net//ckfinder/userfiles/files/58923587261.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/841c81706d990cb1ec1da9827be85e96/83715204627.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee7190396---jepomazigadexugujodenufut.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2a59qrda65l11pu7bdd0mogvv1/77196391403.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/famogozajozugum.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085922a14488---kivirubar.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607133fc7b556---zezovafujine.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pathfinder+chase+cards
    • 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_off0000ee07.bin
a1699001c3e840382c0e51ccb23a7abda224de65fc8347e1590c0ad5bd6f9a62
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10408 bytes
font_01_sfnt_off00010580.bin
6f550c0552dcf3d680ea991a516039f3f140caf591ea57ec0dea2ccfcec67198
pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 17068 bytes
font_02_sfnt_off00013274.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13274 16792 bytes