Malicious PDF — malware analysis report

Static analysis result for SHA-256 926c8205f1fa51cf…

MALICIOUS

PDF

85.0 KB Created: 2021-07-18 13:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbae5d80c3ac49def572217d7e516fc7 SHA-1: 2c839e11d72eef8b9408d0f9d050b7efca6f6cc0 SHA-256: 926c8205f1fa51cf5f4c8c8f18af2b5496d246c46a9112f1ce0c342965d25eed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, designed to trick users into downloading further malicious content. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common social engineering tactic to bypass security measures. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://actaviaserica.org/board/file/files/jezegijofusaradedibip.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3h1ut4c63h4p699fcf93m16qo7/14587507607.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/sabixaxewosipitax.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/walalorekakosezusuperitad.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160731964a0ce0---bodaranebupozuroximipo.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/92309999942.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c835568a---somemabifakakovebe.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/5ch5cuvr1d8712skd2c2u546fn/vugizoridatinugumana.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/buvudawidomawopomixubodo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/59491f4f871d42446df4d92c14aaf2cc/gomadumoparubudinutakolig.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fa472bfd485f20baa66ee2ef174e38ee/37358615433.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0ceef9fe---nusilepofiratun.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/42417748355.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/69fd4d0d6a20a4ce71bd96030969e394/26206923637.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/pnvoht283jr0ra0shkaikqohj6/baxisafexamututigimi.pdfIn PDF document text
    • http://yuli-china.ru/d/files/xokekus.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/tpa61scobcv3614c6aea6tq7r6/85819544788.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b746ca0650e---zanoxi.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/nifekutoji.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/15129287553.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/577c0a31c468c3ae34d4df111850c51d/kugulupakavoxadupa.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/9159590129.pdfIn PDF document text
    • https://inncredel.com/uploads/niwirawasorirofaxomo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b61e2b8e5a16060d7663ff05b4d7d60d/podopekemotemeketovusula.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///bosejamujigigegipisazef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+scan+as+pdf+in+windows+10PDF 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_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 16984 bytes
SHA-256: 7d220f7c4567b594eed921c5d800fec42bb4f1cd27b06a4a52754d16b6c8253b
font_01_sfnt_off000114a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A5 10588 bytes
SHA-256: 65b1dd4b4879a7c03a93ccd97e396a355205f9d0885fca2ff310c41b01bf734c
font_02_sfnt_off00012d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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