Malicious PDF — malware analysis report

Static analysis result for SHA-256 751497d3703eb8d4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 03:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dee0b462146f936d470da9bce6e2abcb SHA-1: 625a2f4b2d5932499cf640cea2e56be3b555cccc SHA-256: 751497d3703eb8d4070f585d52144f04d0d32f5153143e5361361ac3faadccba
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee5e5085b---48197782216.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5097c15eac2b2d36ae349d95f815f486/loguxeviwuzefirav.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/jowonekajikekexajisux.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/18603935563.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/nasilugo.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///18685333993.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/66339198914.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/73684548018.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c100bccedc---5484167735.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210904055016.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/seporirivavusemod.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/75551021702.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/vumolufijusevameni.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/37060129371.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/finulogidesasa.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/79177599394.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/22648859704.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/76269359986.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/75607390759.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/futavexozukevuloluzuf.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ubbdtuae8bvsluued4m3fcfj70/rekuketedewudasomotubasib.pdfIn PDF document text
    • http://grotech.in/userfiles/file/kuvakagajetasazelog.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/h7ujbpjljmhr9dpko3abk3413u/zakipegomexotewij.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f94a8f15---99396609385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wheels+game+happyPDF 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_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 10292 bytes
SHA-256: 155500bdba72ab9a38ef9eee537a9043f82e50a932042e9f76b6d7e3b59ea118
font_02_sfnt_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 18296 bytes
SHA-256: b9298d41edcad3a38bbfce16bdff48a5cbf75994f4380f70a11f83d73eb29916