Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97cd7b60bc34336…

MALICIOUS

PDF

72.2 KB Created: 2021-09-15 22:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d945da3a6c881b5cbef1ed9f7db6898 SHA-1: 97f1e012df0a05cf46d3cab5c7100df9cc0a30cc SHA-256: c97cd7b60bc343369c4d6a3e798eb2da2bdb41647ecfdf951a95cd73b0defb24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=street+grimoire+pdf PDF link annotation
    • http://mfcpavpos.ru/file/59073507457.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/lenimatokiwegirasamoji.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/rubabon.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/waziwugiwin.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/pafetaxamul.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/79250395178.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/73051024030.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/42117070579.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9769a5090---zuletowadigozevuresuwagib.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/82959971933.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/garalijaxamalovo.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/21671633824.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/62916851514.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/jogegejomozikup.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/xijagozumo.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/23770df3848cb1b067731ba766cc194a/rijexazepapinaxitobiguk.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/11377865266.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/56317438546.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/55287190373.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/zukazaderadumakixoga.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614249603959c---23340626261.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/aeebe83ff08ace398a3e697e070e49c1/34222633327.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/99501475946.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/83481536076.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614230d549fd2---mativexiketefimubizatex.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328c916430e---javikori.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_off0000baa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA7 15976 bytes
SHA-256: d74ceae5ff862c1a11c63fbe759f3b4e56d100d7408b416609f8214bb52e5556
font_01_sfnt_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 10436 bytes
SHA-256: 82236a6b4f1f9c6d679b1abf9294671c0f70baff8d6dc759e09d015df160b2c3

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