Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1e659307e04931…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 18:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c93c23ef3cb3654375da9a269e76a30f SHA-1: da256517949d85fbe1e78b75f34549dec4547b9c SHA-256: 3c1e659307e049316d689ee44f55caa42a270a8dba8be1fe0b81c8664a1b3ba9
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 redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=dragon+raja+game+download PDF link annotation
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/15537429093.pdfIn PDF document text
    • http://kleiberit.ru/files/file/16836078531.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4f8db01c3---kinanemazerukojuma.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/34683254319.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/43627728117.pdfIn PDF document text
    • http://sfssolution.com/userfiles/file/50819272803.pdfIn PDF document text
    • http://oris-am.com/editor_up/simuxuzizimixewazap.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3ef3fea9e07cb4c1b65e72d1005b0722/vipamabasupalojagosebe.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/244174460.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/lelupomuk.pdfIn PDF document text
    • http://carszana.com/image/upload/File/21597253707.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b818106f3a---14280827742.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/108980154ae3614a3321eb214ea50abb/42226790584.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/matewogileriwep.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/komozoxutuzexarejewu.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/79584317930.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/kesimomarakosojawovorul.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021923222876289.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/zelijike.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/murux.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148dde80ee42---goxesewulobep.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/kekugezimujo.pdfIn PDF document text
    • 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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 17468 bytes
SHA-256: 29da6432c99453dd5324ec066223ebf986f5a1736a58946a4d2421b5ceaf592f
font_01_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 10452 bytes
SHA-256: ef0cd9460259a212645943695c7c39b0db0b91d63806b8e599bcbbc8751a5f23