Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2ab436dcb57eff…

MALICIOUS

PDF

90.8 KB Created: 2021-07-25 15:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81f231afb93258f07f3e78f690bcb1ec SHA-1: ad987ab1d210db9e6cefc289c1c2c86ee31902d7 SHA-256: 1a2ab436dcb57eff07959b74136d203ab94132f9f333f495e6bf0b6dcadb8774
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2388d2bd18---17462693538.pdf In PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8604fc9a36c6d1a0e969f82a45d8735/guxupeba.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/todupakos.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210611/file/makesekuderekonavexule.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/2ktr21anvnibo0ri7t541ffedn/98310321123.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a8316bb4---rokovazag.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/97b7759bc3d54f31d39188649c72249c/15988242271.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ddb127121---kazakorixevufub.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/totozewuxu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9aaa3a2b590c94fd21325bf55128718b/sedov.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/lijuluwoxowiragisixogox.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/301d363cfd63d0f025d0fc59eb5bc950/97021372148.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfcdeb19f1---21099322172.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/31247671967.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f96b24d3d---zazimevidadajulozedege.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92d3d876b---levafemofekegifugazejaku.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/66940867796.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4ff9e9ad294d02ee6e22fd99e80d2700/pawepel.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/p7d9eo3btte6hu6eg11fvgssjd/mexak.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/78570016221.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/79652278308.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/fubevobunisijirejofelali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=quantum+magnetic+resonance+body+analyzer+software+downloadPDF 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_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 19184 bytes
SHA-256: 4b11ca904af3fa78902df3e347a974540e9a5f8a24ce54a16b37373d9c3335a8
font_01_sfnt_off00012820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 11380 bytes
SHA-256: 95279df85a8680f4f365db78279d0112518849e48a1eb82b83a0ac553fdc4f48
font_02_sfnt_off000142e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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