Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f86c45ffa197d2…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 06:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09796781388174482a38cf7af26c124f SHA-1: 019e08cd73c23b300a3a6d3ea10856eeae4e069d SHA-256: d3f86c45ffa197d22a8feac4a2841c7277f00e27f3af5c5ffdce9c90676d8b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drafthe.ru/uplcv?utm_term=game+stronghold+crusader+untuk+hp+android PDF link annotation
    • https://podgoricki-klub.me/userfiles/file/84067779922.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210906005034_m61g1x.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85463182719.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/33669654984.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/89812132793.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/juxupinav.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109240924269313.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/17943071707.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/7651095399.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/42475073603.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0e553eb13---vobesijokoja.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/paxuwejokidazofebep.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/65985702880.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/69871734698.pdfIn PDF document text
    • http://fxlcd.com/upload/file/14431997470.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/ruwusatakezifili.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/12242754463.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/4210966a6df23e41ceb5be3466a7b747/18366016404.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/sixogikakozegikasejomim.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/59913842146.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d45304ce75---kesojasaxatuve.pdfIn PDF document text
    • http://dentherapia.hu/files/file/lapevimumebesazarapigobo.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_off0000b02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02C 11192 bytes
SHA-256: a6dbe793d55a2c6b832e60b31fb2923c6c736302470438e44d0958565d58e4e3
font_01_sfnt_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 15404 bytes
SHA-256: 12812b0fc9c23f96e092726524e134ca417bd218d5a1ea15f76ea7f8dd1d4a9d