Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd2e09be2bdffba…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 16:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44e1441a1d191080e2f62df5a74ee642 SHA-1: 0f75343669c98b6a7ba928a494f23078eb79ae8b SHA-256: 3cd2e09be2bdffbad166214bcfc667e2973473e45642479dc961ce587d1c6e17
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_CLICKFIX' heuristic indicates the document attempts social engineering by instructing the user to execute commands, likely to bypass security measures and download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=convert+pdf+to+rtf+windows PDF link annotation
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/gagumajotunalure.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/rumegedamedunekutak.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/bapejaparulalakomitudovin.pdfIn PDF document text
    • http://sdds.be/userfiles/file/89062989817.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/51054161858.pdfIn PDF document text
    • http://www.pilartangguh.com/file/latoluladumal.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/papitavogelaxo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zivapelazajidiki.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/34015928188.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/rijurivumoxete.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/56305522302.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/24523916464.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/lafeleluw.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613020ec89060---dibomijiwuji.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/73625439833.pdfIn PDF document text
    • http://davobio.com/upload/files/kemolulozeni.pdfIn PDF document text
    • https://digireg.it/upload/94190851213.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/beduzijopurasegofirewaxo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/363866d6f6c5596aae46ccea65603eff/54236594910.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/6270768398.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251d5ee678---gasigugigixajabagulomol.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/narolodojinefapuzemeku.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d78e6d99369f4c6d015bd944c480b018/65062124326.pdfIn PDF document text
    • http://ahknchem.com/upload/files/xagavipi.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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 17460 bytes
SHA-256: 361845c7c022c603ee69e165a68a826fccabec7a45173ac4cb1524c5bad60f3e
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 10464 bytes
SHA-256: 132fdb49023bc72b81e9178f969129f011149a8f77170c00099af863f99b9ee5
font_02_sfnt_off000120c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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