Malicious PDF — malware analysis report

Static analysis result for SHA-256 b208b7fb6448f0e8…

MALICIOUS

PDF

87.4 KB Created: 2021-07-04 17:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 791e5cd3b0fc7573e99bc4b45de6ff43 SHA-1: 104c59c005871152bd19e4410bda112bc152e446 SHA-256: b208b7fb6448f0e8714f1f68f7e439ecb32119ff859e8a8c2ce3c35d95b5c56a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage. These links likely serve as lures to redirect users to malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2011

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2dda85d61---60501877373.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607744752f9f8---bozevabevixediruluropusi.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/80505995051.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de00f50dbd---26978320803.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608137ce662bd---maxixa.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609182e141581---kijunimutid.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/p4lks7cas5mb43eimalfe2i8uq/kibituninederokam.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/564a5787a25fbfa55a4d3a6326ba5132.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/dosokodepe.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4a791f6c---rinuvewisikerobun.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160835090c9587---30319249743.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3b72fb0f8b745df7d32d394c66856f2d/nimulagijozonex.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/97573d51cb54259f327a374d9faac79b/63558508215.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/65315585825.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1809012d0---54705409148.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/j1krqjq7h0626rtiq75qdtoev7/pigabupojuv.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0354i2uc263euo1lnv7kkma2g1/79576657421.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/20875140560.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160adf89e95656---nuxokowatizubanune.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/pt2uu577u1vsohch2mvfd3ms97/ninoduwegaxijufipi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0783ab59---tibukijepoko.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/5529792506.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/mevajeridalelo.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wogabewanovigowadimitolis.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/jkng8ukn4hrhhsalgf70tecdkf/96778872513.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/41dd2f33262a2eb7374463defcf6533b/leponaximafowujigokapuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=10+facts+about+magnolia+treesPDF link annotation
    • 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_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 17552 bytes
SHA-256: fd0843f3625c4b497f0a63cf75b54a1cf5d53ff23e2b7b6325c66e1d9881b6ff
font_02_sfnt_off00013e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E82 10996 bytes
SHA-256: c6aca218566681c5c78a0ada72afc6584c944e74983c844783d2c80327abef81

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