Malicious PDF — malware analysis report

Static analysis result for SHA-256 935001e7ea2b5f7d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 10:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4af27081cddbba04ba4eb01ea718f79a SHA-1: 75a93367b3b9893bfde3a6f9624958dbb7206e4e SHA-256: 935001e7ea2b5f7d09a82afc15b95acd57084d4709c354695e26f43f558a37a6
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The file's purpose appears to be directing users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ci58v2c3q3i7qonmegtfinjef4/62687735053.pdf In PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/nogow.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/72599854631.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609572b486734---81064612819.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/32816103405.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046bc5e659---47072045859.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/50701827679.pdfIn PDF document text
    • http://poorclarescork.ie/images/11095510917.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/98077353845.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6adb36b39c---rudavubuvulepirutafi.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/17691922295.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/83708162976.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608838831c32c---mufadup.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161097bb18c33f---29801652553.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/1489108305.pdfIn PDF document text
    • http://djapm.com/userfiles/file/17488195941.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ns3383qalbafmg69mkvhaka480/79285368843.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/50551259325.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b43a1294b1f---75644964791.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a849d132ad7cbcf7acb7db577015be36/lofamerefimiferaz.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/rutuxesotosoratazibe.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/15208494861.pdfIn PDF document text
    • http://timapools.com/uploads/files/482860706.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d67fc671af---45699988746.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d8c5410293db01debd63754123d88352/vumowukabekujopefuvilib.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/43301782870.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/de44bef6416e2402e67fc5c5b399e583/defilari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nonlinear+time+history+analysis+in+etabs+pdfPDF link annotation
    • 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_off0000c54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54D 16168 bytes
SHA-256: e86aa73b9fbae4e4ab27735bd72d61c27ad375cfc89f1979c92a2787ba25c0e6
font_01_sfnt_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 10992 bytes
SHA-256: a8933b45539fb8bcf5fd9bff251f84a1750bc41f01ae163712a1364cd0caf0e2
font_02_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1