Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9939b2147424957…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 22:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4c7c282cbd63e7a0d9fc0fdf46387ba SHA-1: 6158b78856c74d0ed41df272dd7bcff64437e8d9 SHA-256: d9939b2147424957792ba85a4766c601616785d0b562e30dd0c5becd37207d6d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution lure. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://safedoorsystems.com/cmsimages/file/23111120810.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/10831928809.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607503347a388---26772127625.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5932746b8---zabopep.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/28502141748.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5833abcbe---17136288902.pdf
    • https://astdubai.co/userfiles/files/20317511907.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0214e19121---sebegebulurunugabubas.pdf
    • http://esistore.be/userfiles/file/runuvameje.pdf
    • http://elfast.ru/userfiles/file/jezikafixol.pdf
    • http://amphorabeautyclub.com/campannas/file/jesusixuxizuzuzuxi.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/roxurizolusewu.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df18064408---37836788791.pdf
    • http://myappartement.de/web/editor/files/54479566849.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/46331426601.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/f0d793f87d82c5c531406f691798decd/zaposivelabezepiluvotu.pdf
    • http://alvitraders.com/files/kozelap.pdf
    • https://baoholaodong24.com/userfiles/file/90662283770.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/44170468718.pdf
    • http://onmamtour.com/FileData/ckfinder/files/20210720_7274BDDB179A1FBE.pdf
    • http://bosch-elektronarzedzia.pl/catalog/file/rowagigikagel.pdf
    • http://hyundai-baoloc.com/luutru/files/66890047288.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/281733999e12ec68d00b64eec57a277c/guzodimafi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=islamic+baby+names+with+tamil+meaning+pdf+download
    • 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_off0000c6d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 16792 bytes
font_01_sfnt_off0000deea.bin
9fe9067492b5df8595bffc22004855f3a0d311f40e0ecdf3d1ef8a0d8602b0ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 11256 bytes
font_02_sfnt_off0000f8c7.bin
57d86c178e3fd64baca314c723f0e1fee3caaaa948549f515d6a032152fc2dfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 17712 bytes