Malicious PDF — malware analysis report

Static analysis result for SHA-256 6168d6af99ef50c7…

MALICIOUS

PDF

92.9 KB Created: 2021-06-26 02:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 70b86d0e97a81537359427c7d3b397cb SHA-1: de18e8b1329729f9041c80998fce5b0fbbc98e4f SHA-256: 6168d6af99ef50c7bf4e225247d37e47f20f4b70ff5bdcf7da3a4afd25841d20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=pain+in+the+right+leg+icd+10 PDF link annotation
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fec966344---17696086493.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/e9b6f89cff0f658c65779532161beff9/95692992380.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/64711284337.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/numokaxi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/imehob7lt9qnmfhhgrvdoq5582/xojakovokasasebosusute.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nitupabosevevodo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/99e02b612f11284e664717ade48d8ee0/4835316551.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3ef748eb6ef55205a6537381434de356/tupevolagezetagetez.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fl7noq9nejpagshacbse2std13/rudogexegakefakapupog.pdfIn PDF document text
    • https://coil.hk/upload/files/faxedawovugipunewipagano.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210608_D8B6D40DF88E616D.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/molokasutokorufenefanik.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3f910bf8---sosim.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f29729b932---kemogowekukunilewusaveru.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/81130095207.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/17927414ebbdd632f9b8b67f07b17610/dibuvivowubudunedibanijit.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/jugupexezogikawodig.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078289ba29c5---45212457093.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081beda20de2---wufimopov.pdfIn PDF document text
    • http://thedreams.cz/files/53262837568.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609593b9d83f9---nexakawubu.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/26631795530.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ova1j14f9d24dikbeji4monrp6/49890337716.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b28f267de78---55924459746.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_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 16660 bytes
SHA-256: 25afdf19fc982c59fc7df1ce61c651779999d2bb9e52a55f7301651330217496
font_02_sfnt_off00014ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA0 10536 bytes
SHA-256: 77a3848e3ddecd717e9264cec37492dba3f8c04b73b0452c520324767392708f

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