Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3a04d9d71b392d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 10:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ea32e635ceedac19b7140cfbd360ed8 SHA-1: f33bf35dc53a07de07079b8912a4d2c2f41eeece SHA-256: fa3a04d9d71b392d7c63018bee962d3453bd27b1edde179f580a643fb03d29c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ddtoyz.com/ckfinder/userfiles/files/4967476078.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438eba93028---vivosowunijopimurabe.pdf
    • http://kuppersbusch.hu/userfiles/files/fusapuw.pdf
    • http://joyandwowbook.com/upload/file/31189741358.pdf
    • http://kystar.net/filespath/files/20210919105026.pdf
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/dokumapap.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/9383985406.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138304ba13be---97236069055.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/90185740992.pdf
    • http://music-saikung.com/ckfinder/userfiles/files/73409757331.pdf
    • https://itchanoi.vn/uploads/news_file/firebokevusekuzo.pdf
    • https://travelworld.ro/userfiles/file/natedanoma.pdf
    • http://5m-tti.com/uploads/image/files/84103714319.pdf
    • http://thedreams.cz/files/girurodikon.pdf
    • http://3qbuy.com/CKEdit/upload/files/95993524672.pdf
    • http://sanga.asia/userData/board/file/35591759276.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/32387407507.pdf
    • https://vnsteeldetailing.com/UserFiles/files/zuminuvojaregewela.pdf
    • https://hotelpancharatna.com/assets/userfiles/files/87891125961.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161398ce25b385---62055477787.pdf
    • http://aaaexpressheating.com/userfiles/file/92929119927.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/sobuxiwolet.pdf
    • https://www.weboonline.com/ckfinder/userfiles/files/60722140982.pdf
    • https://jpt.mysmartedu.com/uploadimages/files/kawud.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448bcd3d985---6035476320.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=insta+stalker+profile+viewer
    • 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_off0000de7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 16792 bytes
font_01_sfnt_off0000f691.bin
95f08aacb024f94de37c14d49508b6d3904be3d459f957ee2d69bb84e7901210
pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 23816 bytes
font_02_sfnt_off000133a0.bin
ba22f002d88a3de4ee7311a6c1306dbb8901b808d97ce037a45bc287d9cd4a35
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A0 10544 bytes