Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed01480c876d29e…

MALICIOUS

PDF

88.1 KB Created: 2021-06-28 08:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 391a6c9d17d67df88cf5102c2b7e59a7 SHA-1: cdfd83bf7e4840c475013d4d1a504f52a19a6c03 SHA-256: 9ed01480c876d29e204a3687890701329f4285a1bbc77a37cee6da8292fb7d07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many hosted on compromised CMS uploads, forming a link farm. These links likely serve as a lure to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/1e45b1b891303c527489df34cfebc43b/zopipajuli.pdf
    • https://semineebrasov.ro/printuri-fi/files/julufibugibes.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/77321058401.pdf
    • http://cuanhuaabshanquoc.vn/files/duzipowanofiwitipubo.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96a0114371---rewamuloxidewevojob.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160755afec590b---wiredap.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/343d037df5e068901d875897ca1b00c3/24328094296.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074927c1852c---kixomajexuxizapawapurazo.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0dda4c81d62008a0fc5b3a69a8aa4fd6/kabumabosefitefafok.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/07d68383ae090e7cd31c4a33d0f8c2f4/7653440103.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf07159cf---dizodonepegirobaxise.pdf
    • https://alutat.com/data/file/gelenudosokulazexiwasa.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782c79eba37---wofibusij.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/3bccd1d8f0ae59fb1c948c3378288cb8/70285039014.pdf
    • https://perfecthospital.org/FCKeditor/file/19359570994.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8331a70305---rivelurepexuza.pdf
    • http://unipsyclinic.com/userfiles/file/20210521085930.pdf
    • http://evola.it/userfiles/files/44961844563.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092425a396f2---69014128027.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/370b89202d78c6f930c38d40dd333aa3/furedagi.pdf
    • http://atek-ent.com/upload/file/97097644763.pdf
    • http://animationcoach.com/userfiles/file/36892601860.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/77dcd62a3db9b1f0dde97a6bdcf1f416/sivekanalanivugobebuw.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c261c688d50---nutomokuxinow.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae4f33d3f1---94019427142.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e4b694fc---81135878120.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=intellectual+courage+examples
    • 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_off0000f377.bin
40dc105b3c1a5f46800ee1881949f215bd21fce5def9d244d73cd212143ca8ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 10776 bytes
font_01_sfnt_off00010c61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 16792 bytes
font_02_sfnt_off00012473.bin
a40f17c94d664d10b21a67a280bca3f91630b13a236278b921010206213e0122
pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 17700 bytes