Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4bf5ce04c3877a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 05:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d5df2cabf0eb7143507ae92eabd4fd0 SHA-1: ff2947ca86b44aec988a88da67e1df48c323be0a SHA-256: bd4bf5ce04c3877a931ccb11dab005fec3bf9b75b994755b52ef69c64318ffcf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a phishing lure designed to redirect users to malicious content.

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 http://piazzademarini3ge.com/userfiles/files/tusedexuvu.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161360b9a068a5---xokiloxu.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e10c4b1426---14759443476.pdf
    • http://sgo-bage.com/public/files/files/84381366880.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/rozikajidigaroge.pdf
    • http://faurerom.com/userfiles/file/91976639973.pdf
    • https://winstar-tools.com/UserFiles/editor/file/93243431104.pdf
    • http://nensi.si/upload/file/vixakegewiginenon.pdf
    • https://talenthunt.biz/userfiles/file/sokalojofeket.pdf
    • http://sictombbi.fr/ckfinder/userfiles/files/86954564019.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/xamesaji.pdf
    • http://jimsclub.net/new/board/img_tinfo/file/20210907185804.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d396655e61773125a1ce7702a4127383/nepad.pdf
    • http://proxima-design.cz/files/file/17371376146.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970e7b1f9c---81183973641.pdf
    • https://trouver-une-ssii.com/img/pics/files/janikixijibaw.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/gavumubobafejemu.pdf
    • http://olguanaokulu.com/upload/file/58057425265.pdf
    • https://www.netcorp.hu/data/editorfile/28232470462.pdf
    • https://middletonchambers.com/ckfinder/userfiles/files/41016332843.pdf
    • https://akamercedes.com/images/uploads/files/78502539992.pdf
    • http://boathousebrokerage.com/userfiles/file/tavulodamaledinegotuda.pdf
    • http://acelybio.com/upload/files/89188080574.pdf
    • https://dortmundpools.com/contents/files/wepis.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cut+the+rope+3+mod+apk
    • 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_off0000de6e.bin
396ba7ad4661f904211a7dc784ef3a355c7593705461fe11f3e51836f1eb053e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 10640 bytes
font_01_sfnt_off0000f6e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 16792 bytes
font_02_sfnt_off00010ef2.bin
7a837a07a34bb7c2746220abbb875b807d7064325e06239755ee5d8215b072e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 17296 bytes