Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d61acc22388020…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 04:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 440b865fab22f3afcae201fac8fafb2a SHA-1: 167e661633b792249f38b0e2accdf07fc6dd00af SHA-256: e0d61acc223880205e697b62474bd8371d927f75a4f83d3193dea9cc2595c7db
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics suggest it functions as a callback phishing lure, prompting users to call a number in a context of billing, refund, or security issues. Numerous URLs were extracted, many pointing to compromised websites or link farms, indicating a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crewmak.ru/uplcv?utm_term=how+to+pray+for+offering PDF link annotation
    • https://greenfuturevietnam.com/Upload/files/26515630354.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/88878324890.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/zotatikatirolilususokag.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/94g8r94qejivchgf62qqqcni75/56025631400.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/6938984298.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/vizadafoluguzalurinodefe.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/pakivofenotu.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/kimurufexigizubiguvaluwi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/kotusagogiwirolusower.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/73s4elgn07fcf17m5vsm0avmk3/11402289032.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097227c8234b---tazepipuzedawefavulizosom.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/pexenefutasuwalawolitenab.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/15317064209.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hshm61in6tbpatofs5ltg80073/22209080211.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210724112632_fo4t4r.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1eccb1252493b066ab8c3550b0507933/64485591009.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/28641243933.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089549c8c44d---vevimuvitu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b85fba9b60d19f6fedbcb581631fc248/51796575035.pdfIn PDF document text
    • http://amandamaitland.com/images/file/ketivok.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/62536598983.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/8f12d9q2qb5a1kjl1g4ugki57o/pugabemalaxukujuriw.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/rudekupomerexife.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_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 10508 bytes
SHA-256: 531192b2d0704d943bc39b6470f50ce64fb52f5a12dfa3e2ea74544c7737d6d2
font_01_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 17660 bytes
SHA-256: fb48ad451fd0926bdb948becde6beef26444009575fefc9b3910651c4e76d03e
font_02_sfnt_off0001413d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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