Malicious PDF — malware analysis report

Static analysis result for SHA-256 0191fd9b8f4cb406…

MALICIOUS

PDF

94.9 KB Created: 2021-07-09 13:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c11fa674d3dc0fff57e0c94f4beecafd SHA-1: d2e281547c1b83dad56478cf1661c63a6e21b9b6 SHA-256: 0191fd9b8f4cb4061d641a21ad74512b2aba07421c73acf175770c63024d2986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The PDF contains numerous links pointing to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://istocdukkan.com/userfiles/files/72847587287.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/kess6qo2c576t7anttidjg5a2k/mivedafegivepivew.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/g50tquh3jur4lqq7gmch0ao7d4/51679825694.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/24646545252.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/e7134418b9bec8198291559fe241a2a2/retorovimepedot.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8knvm7tibk3se3pmeef5b3tmss/papelomupetolinawubinu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a44998311b---rodaduwisabi.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/45223611084.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/89788281315.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/42755131590.pdfIn PDF document text
    • http://goref.ru/files/file/fukilefutugeluwupowedew.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/tekowozuganow.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/bufafexubus.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/07d9af22e48fd004fc27843d64cf5252/bovowokomuxawuz.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/34292685841.pdfIn PDF document text
    • http://zuche0551.com/upload/file/65523184062.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e5cb80514ebac669ab8c44ba437c5c29/wixomod.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609414b1ee3e4---41419450785.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4452d0e5dd16e996e5abd493eee8322e/kezevogenipox.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/vavafovuteru.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/josasigado.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b67e00068---35812305036.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/86498472711.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/grg9cvnsmlomm7dej89v08idam/9584222907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rewrite+the+sentences+using+reported+speech+it%27s+so+chillyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000156e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x156E4 16272 bytes
SHA-256: 5d4671d1332e890e117e8760d76ca70cefe9e63041615d1f5b80c5da97a076e1
font_00_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 11012 bytes
SHA-256: f79219cdb7553c760c670b337a4d5755048d9e4facafdaa00f4d8c77619c0aee
font_01_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 22316 bytes
SHA-256: b9eb4257a660cfb979e6f48ea7a4713431e664e0c71f2fe8480d038d9f28338c
font_02_sfnt_off00013ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1