Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4380398ea95696…

MALICIOUS

PDF

77.2 KB Created: 2021-09-23 13:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b06f2ba50f58be720fb7455dc10c9a9 SHA-1: 9e180b5df76cef0b87680637a6783a35d4225430 SHA-256: 8f4380398ea956967db22218f7ddabbb6afd5cdfe92b9ac7f04b22ffb11e6c09
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a phishing or scam campaign. The presence of numerous links indicates an attempt to direct users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=tubemate+official+app+old+version PDF link annotation
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/fixivipinelitesajup.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/98021257363.pdfIn PDF document text
    • http://melabo.com/upload/files/zatinunobexadijeni.pdfIn PDF document text
    • http://demkapi.com/resimler/files/27841145294.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210907165516065326agp43o.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/143d9e5ee3ff1bf9cf38f678ea410b0d/9651679775.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/12bjlkrmjmgllqp7418u5lch60/61655193568.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/35294757546.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109071627062568.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/95152523876.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/50777548966.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/xigetifu.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/tujiwiwaguvok.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/91080863402.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/37181815522.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/xogoxugomoboduki.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/fugipiveposixe.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mepulukukusa.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/95484812639.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614251a685019---wivolakepivogugatixozi.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/32086599156.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/39711864669.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/nadekegadebi.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/69525901281.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_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 11052 bytes
SHA-256: 1174708e18186f8074f34babeccd67d89a201e9c4476c187e7e86030d1b3c49c
font_02_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 18008 bytes
SHA-256: c16cca9f7ff1c83358f1c9ce68da5a5a007c75e8b41d679b552cb991bea04817