Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3eec9c2004feb92…

MALICIOUS

PDF

114.7 KB Created: 2021-07-24 01:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03c44802c55e3a1e718669df711bc038 SHA-1: a7146d07e2423ac62adb5070d0235a9f3973a2dd SHA-256: a3eec9c2004feb92877cdf3338e13e5e46a04b99e617b0890f1ded4b856ecba7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to redirect users to malicious content. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c228ccda1a70f0dfb9a170d96a88e178/89971472395.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ina38rel9aqj39dtl0ogs4kam5/2215641941.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751087c1a8b---fafilejirigudukuxa.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a76097247d1---94447017565.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/rafibexibu.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/69539877855.pdfIn PDF document text
    • https://tangente-mag.com/img/file/kagapebaludokakusanunanen.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/80669367188.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/ratov.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/moniduzazuxi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160778096bbea5---zaburejudujaxef.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/litutepumax.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41468fa14---bedagoga.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/62836554246.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/72624795063.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607822b2936a9---61429380101.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e10b68a0---dazelirisid.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/wodusugareligozuxa.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b5da9ec3---18399443132.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/japekig.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3d110b1704c7599aedc3b73ceb8dbd94/zedetewixagefu.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/9558128549.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160746d723b0fb---vebukinefesafizowamo.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/93684178539.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/73251178887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+start+ark+single+playerPDF 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_off000158a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A1 10708 bytes
SHA-256: aac21d9c3d1e9a74ff9fbb91f9177a5daa818a1ed74aa207adb264df0fabbc96
font_01_sfnt_off0001715c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1715C 19300 bytes
SHA-256: 8a56fc665f520914eacb2fb4b7ab068e743d1c6cb08ec78fd7c67ed34a9db562
font_02_sfnt_off0001a48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1