Malicious PDF — malware analysis report

Static analysis result for SHA-256 117c105966e1a771…

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 09:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75772143f48aa7379771a64da46b4ec4 SHA-1: 670b91f30f79f7ed9353c9b20ef812c69b820f1c SHA-256: 117c105966e1a77129c4931546a299c33db08c19f677d9a061a836ad40e5c305
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern appears to be luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://queure.ru/uplcv?utm_term=minecraft+alt+accounts+generator+free
    • http://vytvarnyobchod.cz/UserFiles/File/99777959809.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139fe12b7d93---41338887292.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c184a9ba6---87490234257.pdf
    • http://assisdrive.pt/userfiles/file/84461056675.pdf
    • http://palmdale.thepokeluau.com/uploads/files/2395502156.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/af91f210b2f4cb32f3e1bc2c741927e5/domuj.pdf
    • http://avon-bratislava.com/files/files/tabusikefosu.pdf
    • http://czechnews.cz/userfiles/files/rofawu.pdf
    • http://topnotchimports.com/ckfinder/userfiles/files/37214282078.pdf
    • http://jfhcoaching.com/userfiles/files/15441891754.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b26d144ee2f36d5270e859d3a146043f/mefufanobiwafana.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/17525678703.pdf
    • https://songhongresort.com/img/files/99020035620.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612eead742b09---wovugepudedunapelono.pdf
    • https://hidropomp2008.com/uploads/userfiles/file/73443762707.pdf
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/41290107663.pdf
    • http://samafb.org/uploadfilefiles/36577422258.pdf
    • http://eclickapps.in/userfiles/files/narikalefezuzeze.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/wuwararu.pdf
    • http://rtm-plus.ru/ckfinder/userfiles/files/vuvaposasepatumizatuvu.pdf
    • https://mar3ol.com/Files/files/bejojuvumegewuzaxoburoto.pdf
    • https://cpsguffanti.com/uploads/file/98434489654.pdf
    • http://tianlanlawyer.com/filespath/files/20210914003630.pdf
    • https://m-astar.com/UserFiles/files/puletukoluwinolelujaf.pdf
    • http://4reality.cz/userfiles/files/wuzejiw.pdf
    • http://pedraferro.com/files/files/rasenusuvutazawiwosukimak.pdf
    • 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_off0000b873.bin
ae8fbb39c2fdf987da5dc83f04ed15303c53c260a0a5fc9da71867e1b0c06a0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB873 15584 bytes
font_01_sfnt_off0000e025.bin
28915afb48fa51350bcf57df17ef6ae13d695f850408d6a8d35de2ee998ddc86
pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 10604 bytes
font_02_sfnt_off0000f88b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 16792 bytes