Malicious PDF — malware analysis report

Static analysis result for SHA-256 106200d96c1bf4eb…

MALICIOUS

PDF

92.8 KB Created: 2021-07-03 18:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 96e8457a51926dca62366c338aa3f30e SHA-1: 3e18c2538b68150ed8ca219e10334430d87edcb2 SHA-256: 106200d96c1bf4eb0a9ae3867906f12ab19c575846dff9048c5b363da05a0f41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate effort to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=resume+format+for+experienced+engineers+pdf PDF link annotation
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c9f77be7e4d23de439055d4fd5618d59/rudebazatobimatadexofozal.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3c410l2d1f0cic6pvip3mqkh5q/xilibigebitimesake.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/filap.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4442d1425b---12357451941.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32700d4980---garadapupixibudoteja.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1f230a63---61549086735.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/2ca88c12972b8a4322fd3a6cc9ac7370/gukufemefemokoxijeburi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/acf8b1536499202caa8d9d9494180a96/53150227518.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f90ecfb3---15755449198.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf20f47aa7---borinanegedirinuwuwu.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/74982592681.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/38851846614.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/80918067118.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ce57fc71---nudeparedakoden.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/bepofovabepanojebaduwomel.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/dq8ojn88jgd60pu5kn0o5ukp65/ribozixuvedazigi.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/dufena.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eeec2d1e4---92116025375.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/nhnl254r03454oiufr59bgi133/63685025767.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0ef21ca583e7ef8f7d6bf919e9878928/zijuruv.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf035355b---6691717849.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5hor1ppn5olgonkgc8ppqh0go5/33660204541.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_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 17392 bytes
SHA-256: 1101822d42e18368eb4ee7c9a2947328bf3ce822a022c37981f0ed806b357c24
font_01_sfnt_off000133a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A2 11164 bytes
SHA-256: d714b102ac88d111ea0b45125eb07823c1fd3b3873ef797d3746e0678f532714
font_02_sfnt_off00014d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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