Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a74352eb6a4f4e9…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 02:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f96a4a83b0f90bb9ff4c967c95b15e5c SHA-1: 6921695e86beff0a9fec535b64b8e761d58ff5b5 SHA-256: 6a74352eb6a4f4e96eb16861abf019cebc62cfbb274398adfbd31d08b7e28745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links to external resources, many hosted on disposable or compromised domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://haiqi-machine.com/d/files/71169930706.pdf In PDF document text
    • http://gaudi.tw/upload/file/71339938710.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/vonoluge.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/16940092424.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/duvozob.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4f5abb602f07a238f754a37d87621230/77521415884.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/tufinovejosovobow.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/83413710025.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/2tv93dpcuoiegltbmpsbtjilel/47042256028.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/vusus.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/kikilodorozamewexadit.pdfIn PDF document text
    • http://soupworld.de/upload/file/77802058961.pdfIn PDF document text
    • https://primer-spb.ru/files/files/14460163419.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/nuvevorexuwibuxisopezujo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba650f2a57---71204494506.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a95c8dc04---sulimidapudufe.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/fisevokalo.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/pixeselizezaguzalusu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/31935268800.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/20180787948.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/cee7ad63bfb52def6d54acb822c712f4/rikotogixizimol.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/wiluwafotuxitawekituzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=universal+remote+app+apkPDF link annotation
    • 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_off0000d1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 17244 bytes
SHA-256: f1ea36c7c618a1d7db17a6ac40b4603c6d5cf8c9e69c64aef170b211d47466a0
font_01_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 10580 bytes
SHA-256: a5d79ace6f6229b8da98e65a85258faea9b06ba3c58463ac9bcd0d487010d312