Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3727abacdf9c95…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 09:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53049980b1d5d576eedce02f0e3edd4f SHA-1: 35ee004e893437c864880c301cb14e0a38afdfd1 SHA-256: ab3727abacdf9c9584fd65b7332a433627194da00f788affe07e5a81b0ff5c8c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF functions as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this phishing or malware distribution vector.

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 https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/02oaf7s2codc8e0j763fhu0jug/vobatetajuxelilaxanawenam.pdf In PDF document text
    • http://pobierzplik.pl/uploads/files/37736121113.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/fodcdtb486mgen8mi32ci3e7u3/93102420163.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72652d0cc2---44768321892.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/tumekusamovokusuvupetis.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/tuxesebefigonen.pdfIn PDF document text
    • https://citronel.com/userfiles/files/37744007674.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/figunikew.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/8589762567.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-14/20210614050040179607.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/sitizakix.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b78fc040d---99673912394.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3bc218305---xotopidisemu.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/devizifukatimarawijaj.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/jasonemikutonuguxubuguwaw.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/74368489170.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/58914424544.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/retefemukorojo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2fe737ed9360539406dbdc61ed535dda/7603377825.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7ef9c0e68---58667972309.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/fejilekuwimojasekone.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/9cde81b60e2b2caa431d9b9a3d90d383/42855301420.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609d65403ce57---85702062037.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/wufotetefijujalogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=informal+logic+a+handbook+for+critical+argumentation+pdfPDF 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_off0000c23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23E 16916 bytes
SHA-256: 5a58037b4187eb4cb14b3df9416b1a25ed76e99ba0b33b5b7eff0e3995085e0a
font_01_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 11180 bytes
SHA-256: e939c06a68cc778977582dfd1728098390f0c756c7bf5fae150e602e312443c9
font_02_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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