Malicious PDF — malware analysis report

Static analysis result for SHA-256 9765a0c7e5fe21bf…

MALICIOUS

PDF

100.6 KB Created: 2021-09-06 23:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 02cacb0b43a21ec2ab5fee0f3ca4aea5 SHA-1: 90c0b9f5bfeedeb27c9291804fef366cc13cb52c SHA-256: 9765a0c7e5fe21bfbe84ec27b7a2d4a9a350a58f8b4bb4b55ce3fdd84e5a4171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://luxe-pools.fr/i/File/28912041325.pdf In PDF document text
    • https://pasifikendustriyel.com/userfiles/file/sopapomek.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/vavopuzezabujokigepatudos.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/bufuraj.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/sumelaninoxumorimaritar.pdfIn PDF document text
    • http://elskenecologie.nl/files/3911395685.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/56261573660.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/77564509791.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/c1b1b042f0942552cf6e4a9cde45955b/67845095430.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3909572d09f11126c8629269dbbd9bec/goxewitabizodere.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6a324b0c---92463324635.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/wamipazezugerisadefebe.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/xejitokitidetonegenazi.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/bejofetovevenemiton.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1151dfa680eb381110539069241c9d09/20178804790.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081f1c383468---butifexigimamesowege.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754464e7501---6018397608.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/23680262824.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/daperisenane.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/ralemakizaserebimobobut.pdfIn PDF document text
    • https://medtek.vn/storage/file/tevogisorakifakemopam.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d3b27c0db0c41c511fe05f58690d1b2c/24210216903.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/dofodepuvibidorisuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=baby+jogger+city+tour+lux+manualPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/53c47e423c76576cdb9ae3d90619af31/kiwebiw.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_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 11044 bytes
SHA-256: b446d603b781706598ef4385affa6cef4d7693f93f7c7e93756de490ef683198
font_01_sfnt_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 19472 bytes
SHA-256: 72939193a9637e0087728d71945aa5c0b1c97d5e7c4864f4208041a0b57cf4c7
font_02_sfnt_off00016aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1