Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6c8d0e5c16adca…

MALICIOUS

PDF

86.0 KB Created: 2021-07-16 04:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4e7da75d1ad346a9ae4842dbb70fbf40 SHA-1: e463f045549248865d979693c7eec1c6151304fa SHA-256: 2b6c8d0e5c16adcab08c43006127ab92e94f68d7a386134a4f5f5e46a1d62e98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate the document functions as a link farm designed to distribute other malicious files. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=how+much+iron+do+you+need+to+make+an+anvil+in+minecraft PDF link annotation
    • http://goldcoil.com/uploadfiles/files/65557257955.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/kugudosok.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/42613455506.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/savonaxotagurojekowus.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd657f7d941---52856307275.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62ef1258b8---faburamogolej.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cff3e6d1fc---4906291369.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/93f01268b8f020431ab53bb065476735/30892644357.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/25330580564.pdfIn PDF document text
    • http://goref.ru/files/file/31118293790.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63de0ac66e4f98fb32eb1dbaf6eb5c17/rewideneku.pdfIn PDF document text
    • http://chayka-svg.ru/files/silixiji.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c8f465d7---vefoxedejatusonubi.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/vagetokafutemofenabik.pdfIn PDF document text
    • https://2acontractor.it/images/file/pogepomozoluxebaxubux.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/wikuxiduxigiji.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef60e9f219---53357107791.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pazok.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ea720a2ac---69101625088.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9gnlfec6gh91ff5ckr0ds76ulh/57813035709.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/76055769460.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c08f2b1d08567d81829c5c465ce3d377/27750922876.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/4109151274.pdfIn PDF document text
    • https://slide-bearing.com/d/files/bawajogikaleromunazopuru.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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 11020 bytes
SHA-256: ef6cdb15b9fe716445d88cb8b00d869864390ceba7c6de01eb02660d625b2091
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 17012 bytes
SHA-256: b3e78cd15b0608250abc487b257dc03dae41fabaa8d7842404c7476f2e7d63a2

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