Malicious PDF — malware analysis report

Static analysis result for SHA-256 13809c96fe4ade3b…

MALICIOUS

PDF

96.3 KB Created: 2021-09-03 15:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca0a6c8a7bffa711053add2f707849a4 SHA-1: 681e6034178e146b9864878b8cc20f30cdb66ebd SHA-256: 13809c96fe4ade3b9a117f4fade98fbae07225de54595d9338465831bde8f1fd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=forscan+manual+regen PDF link annotation
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a0e3eb58---dodebonev.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3f5abc81c3a3bd7105ea9860a36c9f0c/88982184012.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/79324017670.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///xotofekupiximutesiwenidaj.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f1af811f4fe593755de41a4a0f750574/kafub.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/fazalopiraseb.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/womigumavavabawado.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f95c314f7b3ec9e4fd57729cb19c96a6/mogexitiderimud.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/buzogugeriberetawujuw.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/satisonopuso.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a51c65d33baa3a60d4efbd933994a4a5/zezitaz.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4cf0b4aa33d05ee5c8f2e37768a89237/15858431899.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/237a775b0b3c7e810bd21fbd59fd3395/72602372402.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/66321035661.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/855c60ebcefc16d4c9749afae6e7a5b7/91049313553.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/4015961961.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/73466035009.pdfIn PDF document text
    • http://abnicum.ru/files/file/fijulugoju.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/niwudapajobavivezef.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/mefed.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085284123322---24570094337.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2627467ba---32578490223.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/bn9jb283maftd80oa615uabcj4/womivij.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/73915096625.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/tebutulef.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_off00010fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 10460 bytes
SHA-256: a944045ade31b923c7273982de7bd7c43ef3afbbea6f80426c5778c2c6ca4c36
font_02_sfnt_off00013f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F89 19696 bytes
SHA-256: 9c4b722f8e99bd7f1fb42d2e43993665c113481688e531614d60a9b677fc8edb

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