Malicious PDF — malware analysis report

Static analysis result for SHA-256 088d6ea5cd0ac5b8…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 03:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53f07e33b12b716e03bbb5b22b163884 SHA-1: 9b7c849a7dee969eb545b2eea1e1e7f8f379d6f5 SHA-256: 088d6ea5cd0ac5b8137ddb384ca44fe5860edf3e666dd59300b2f830d8b87105
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/jhe62lnb84nh5uv4t6g8u97b00/14447611072.pdf
    • http://corising.info/sa_upload/userfiles/file/20210817134806.pdf
    • https://contact-house.com/fckeditor/upload/file/41392291571.pdf
    • http://nfc-lampang.com/user_img/files/jeronevalaw.pdf
    • http://wawabed.pl/uploads/userfiles/file/nimakoroluxoripis.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/5644b6265b82430bcd6a644717bae661/gizekoweki.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05151ceaaa---11260576840.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/728d14e8468592c100abf38326117525/goliwotuf.pdf
    • https://magatek.com/documents/file/fazamikijarekilap.pdf
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/7166430621.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/nutobariweraged.pdf
    • http://smitheaster.org/clients/861344/File/xobepipugaxixemukanu.pdf
    • http://billsky.ee/files/file/punujuna.pdf
    • http://asokmontridental.com/userfiles/file/88307545625.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60f440bcd3---daduvaxekikifunego.pdf
    • http://envisystem.com/upload/userfile/files/39549481865.pdf
    • http://inimtrento.it/userfiles/files/10550401846.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/sirimijupigikaref.pdf
    • http://saigonford3s.com/uploads/2021-07-09/images/files/xesorumojezuj.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/gafevoxevuxim.pdf
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/b2b535c4b3284d2dd345980e8e8e10fb/nigut.pdf
    • https://onwater.my/uploads/file/20863711124.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/zewuxeziwi.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8741d3adb0243c296eccdafc544638a/nufepatalimekobesopomip.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5dbntg9skl2emg6nv73v915jeo/zawaviki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hermeneutica+biblica+pdf+henry+virkler
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fb.bin
c1cba11d0ec1cf603458466fb54c2cd45770386ed7d73a5d23ad51ae3b152bd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 18416 bytes
font_01_sfnt_off00011a85.bin
199cc8ede22a01e1ccd6c9f321b25cf652c7334765d7bd0eaf216364e126b14d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 11100 bytes
font_02_sfnt_off000133f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 16792 bytes