Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78cd4100e6e8617…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 08:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5ee14744428fd668cc7804b08f7a69d8 SHA-1: 6c055f15f45ad2a00e139c78e76c54366ae90ba7 SHA-256: b78cd4100e6e86171d0f224c0c3a9de7abd3898f8d9ecd47806f330a8fb7a4fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on disposable hosting indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=sistem+akuntansi+penerimaan+kas+pdf PDF link annotation
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4f31df9a7219546c52074817f310ea85/77410879371.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a262ebbf7---wonosejolewuw.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gft2jq8uego0ap7588ntsadu97/tifubarumup.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160782fac54fd5---suwabaxi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fa0ddb0ff4b99788b6808a64e672c22d/xulezoxapeve.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/xafuwejamanulidifu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a234dba2---14163924929.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160704ac764f3d---66145121764.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hld9bu3o7rvhfrn4d98n0lgjt5/2130366719.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/sobafakapiwedadisitusa.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5b751923---42323409263.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/lawales.pdfIn PDF document text
    • http://grabnerestriche.at/fixunu.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/wotidibagaxemu.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gm9vdrthh5h4mbep5obov3h47n/texatavanalavubozad.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160834f7533eb0---lumeluritaluvivejelulux.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/525857cc8c7a512f0316e53e26a3ff19/53371182149.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/lenijamupisekidenum.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/kikejazoteka.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/soronevaxejowejiwimukan.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a827914aba4---zelilidakamodemak.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/44692467420.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_off0000c541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC541 15568 bytes
SHA-256: 27363442732abf57e1c54a5dce2d158a6c10477a4eaddfd127f1323c95b8d2df
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 10760 bytes
SHA-256: fe14d898eebf7df49e74239bd02accee364bf77a78183d1fbbc7261e25c778ca
font_02_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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