Malicious PDF — malware analysis report

Static analysis result for SHA-256 a865b4ed83d20dd3…

MALICIOUS

PDF

87.8 KB Created: 2021-06-25 13:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79d15ff67cf4ffbee848cfc870cb6fa0 SHA-1: cc9dd2bcb65e826f5308de075df0ce63604ad05e SHA-256: a865b4ed83d20dd3a4bd3a01f79b621188dfe4af905a5ebf9329b9e0ed570a0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=advertisement+class+12+situation+vacant
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb37c68327---sirutatavixe.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c536bba7b262ced99961cffb38c06486/gawatozafororusok.pdf
    • http://sdds.be/userfiles/file/bugasoxagedizotukojir.pdf
    • https://samarpanbharat.org/trila/userfiles/file/32850363488.pdf
    • http://studiofapas.it/userfiles/files/65685707392.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ijt1dlgjdh2960sa2pg4kcigao/88760046329.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c953629f44---65971595769.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef828eac78---39249044034.pdf
    • http://allaboutdowney.com/userimages/89663538513.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd55b3b39---jetijokumazaresuxufepi.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee521f49c---dubufegebugukat.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/lefedozoxatik.pdf
    • http://strahovka66.ru/userfiles/file/nifasanitijakurizamadi.pdf
    • http://ucity69.com/clients/861769/File/vewimisunupiwoxeteluvemap.pdf
    • http://project-lovcen.me/userfiles/file/zuvavakago.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a70081ae6c0---45651214081.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f020.bin
cc487c36b14eca3a17688f98da7a565e5c05c44f5f72e20533119ccccf8f63e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 17900 bytes
font_01_sfnt_off00011f3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 16792 bytes
font_02_sfnt_off00013751.bin
d788c974262fd917730ff029f873a13579d81c0e6faaf98f7d28ea6083b935c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 10848 bytes

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