Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b0bd31485d51b8…

MALICIOUS

PDF

70.3 KB Created: 2021-09-20 17:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b271e69d0c15b8929b4da47b5f14604a SHA-1: 1733e634f61ba058e116e544485e3f9c7b0fa02b SHA-256: 68b0bd31485d51b87d4a444f6e39a15b214797e0e32a05e5c1d9510301d57630
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites or disposable hosting, likely intended to lure users to malicious content or phishing pages. The presence of multiple external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://infrive.ru/uplcv?utm_term=play+ts+files+on+android PDF link annotation
    • http://noelex22.org/userfiles/file/36934968030.pdfIn PDF document text
    • http://nfc.soo.jp/file/majusaxuv.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210917034325.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613406eb4bac2---jususugarosinunubokizawa.pdfIn PDF document text
    • http://humanlitech.com/files/files/wovilazulolovimugetom.pdfIn PDF document text
    • http://yuha.be/_files/file/75552742562.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/nokakizofunoruwupopir.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/89569711672.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/podosugurakikesuwegowif.pdfIn PDF document text
    • http://herve-coiffure.ci/files/68726484354.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210906030515.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210905043521356403mponjb61h4oc.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/gezoditekalaxafanater.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9242a7d0---xejovarexinojat.pdfIn PDF document text
    • http://domosplast.hu/files/file/28654485831.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/59656822711.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/sawurovadojeliwudomebo.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/16266747146.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-08/210908014241730670rsh5au7cmjd5.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/82883535491.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/27042355384.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/85139950077.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d46bd894d---tibovaxajemilepefokobe.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/75904035701.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091016464595.pdfIn PDF document text
    • http://recviem.ru/img/upload/47712756162.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_off0000b4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FB 15188 bytes
SHA-256: 8fdba1d7ef648358d9a6d818c9f465d04fdeecfb1a7f322fee592dd53a200f3c
font_01_sfnt_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 10460 bytes
SHA-256: 949b8817e9c5086ebe6cbca105408b60f67fcc8c9daba8e8102be7fed3d7b8d2
font_02_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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