Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dff415d1a7f9f74…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 09:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a1988bf81db6fd228b3d3abfa8599b0 SHA-1: cec315e2bc59cab0e1e6cda074bbc005899c2704 SHA-256: 6dff415d1a7f9f7415439d599e55e9ff7b09aed6b6c5c21bdff5f9ce10ed5087
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://jplus-ag.com/upload/files/BodyFile__613667E923B24.pdf In PDF document text
    • http://pol2-simf.ru/userfiles/file/majemaxijuwum.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/nazowunulewowemopi.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/5932650009.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161355efb848c2---wogulovuzefigaduwixera.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/jurukimamaxexesimasafot.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89d1ba9da---16024168535.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614590a4447f4---96987325368.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/tefowagexazixa.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/vazevekumuje.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/papuwimubelejunilenawojud.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/gubefevakojup.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/522f21449ce2174dc59ade1fd5c0c9fd/bizemodulo.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/simuzujokosatilemu.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/pogera.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/59889026339.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/74349619861.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358518ddda3---45076513393.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210912140732.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210909184355.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/44140402014.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0f7f2287---32889352165.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///tapuzodurof.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/norasoribilomaxefup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=six+letter+g+wordsPDF 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_off0000c86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 16840 bytes
SHA-256: 02aa30ade044cf5f0c4e6ac2314de67ba44ea4e0df4761d6f7348f40facbfdfb
font_02_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 10420 bytes
SHA-256: 73b4e8d83e369ad87e2ed16821c6b6dfd1c76fec98dbf20f3fc01b6874ff3b57

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