Malicious PDF — malware analysis report

Static analysis result for SHA-256 4104846a606528b3…

MALICIOUS

PDF

80.7 KB Created: 2021-08-16 09:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c066ef1c0ce69cfdc50cc1dbedc1f789 SHA-1: 16b580b0fa959a525f8511bd6b289f36791c81cc SHA-256: 4104846a606528b3e83688dec1a3f53afe6596023d946ce44c44a9f68477c1ff
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to external URLs that likely host further malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://medvor.ru/uplcv?utm_term=toad+obd2+software+free+download PDF link annotation
    • http://siamsnail.com/media/userfiles/files/42596003066.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a385dd78a---69834606092.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/69657493885.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5s88borem20kpc067cief19c1i/kovoxukinekimabojis.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/92165370315.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5d6e41d2ec4dcb1f10ff79b4d09f7820/66645677652.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/d4ktrtlo10i3d5lq20cj9p3tuf/45419002652.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/59253419142.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/4724993669.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/vozopufugusupavovife.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n8h8h7sukdcp298ns2p78us1h7/41717688184.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/89735501016.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/67002841944.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210706_236F13CC12558CD1.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/jolasite.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1e60m7ie9aar05eur6b1p1l7nq/mugogijubozepinelef.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5bce14303---60393642362.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/178b4f70f3a96934653f771cac5a0ade/nebagojafopifuwedurugix.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e067f2b2---bunebesafujaz.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/gupevapamufivugef.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d62aac4fdd---pikofebat.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_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 17028 bytes
SHA-256: eafffebca0b452a8f2593a33b0cf5bbf44a007f925d10b982d08b1747818e30e
font_01_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 10564 bytes
SHA-256: a516ef87b101b37b5ef8156df2a726420bd57a51f5a0132e9bcf99ae63c97ff4
font_02_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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