Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f41f1120972a375…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 20:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9416fcc8fcd7fbd8ecfe19de1a296d37 SHA-1: 68cdeadc9a83498d852a76c9024f3b397d1e7bc7 SHA-256: 7f41f1120972a375b7e49eabe11cdbfab08c78d82ead5d3bafa6e3bb6f2c6e69
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these links, potentially for further malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=psiphon+vpn+free+download+for+android PDF link annotation
    • http://www.koeru.eu/failid/file/refimenitigawedeti.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/68a9b5f3fadcbda020cff2a4b4cc1e53/rogewevilobapavanod.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/2665615499.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/pusodeguwalaxoxun.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/zivilujom.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109010651301280.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d06b061c37---ruwimolevawibe.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906175812388020.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/17406933340.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/81093041285.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/lamurekoposodiwozumisik.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/77777214329.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/93063165847.pdfIn PDF document text
    • http://zl369.net/userfiles/file/76457198939.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/98440696940.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/besonuzodozetefowezim.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/xiwetizomatuxupuwepo.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/96445178599.pdfIn PDF document text
    • http://strap.sk/uploads/files/32676491671.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/motufimulunefetuzigomal.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/9134934416.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fubowadagolilifavabeni.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613627490ad6c---mofexe.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/21297796475.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/11251838461.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/29593222549.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_off0000cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 10648 bytes
SHA-256: fd4e39313c282dd9ceeccc6d20a3b23560069d36ed9f4b44bb13bd2b89aeceb8
font_01_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 17460 bytes
SHA-256: 5517e92e97202c9911b51b3c2924ab4700ef28da556b11fc3054021f0d4abf65

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