Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3fe6b5ab576c01…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 17:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88f17aef2719684268012686565bfad7 SHA-1: 7131724f6636585a5a24d7348a09678998448740 SHA-256: bf3fe6b5ab576c0106ead221ae3a5c3c8bcebd7aa1e158163de738ac1eb73b39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing trojan. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5d2db9606a3fe8518ac835d4c9140ce7/titifijiwewodutiwoj.pdf
    • http://les-dvorik.ru/userfiles/file/71972971065.pdf
    • https://sogelec-eng.com/files/ckfinder/files/72713004290.pdf
    • http://creatinglifeoptions.com/userfiles/files/jeropekiloxedokitiwugotol.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6907a837---81800978542.pdf
    • https://hsse.cl/files/13251862723.pdf
    • http://kmsenior.org/file/files/40049836943.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd6e3d231---tubeniru.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/tasimobukaraxis.pdf
    • https://alley.52886.tw/uploads/files/26191664552.pdf
    • http://pieseclimaauto.com/files/file/12830054876.pdf
    • http://beergolfers.com/blog/images/file/50276082778.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/teniwikaxesabuzijela.pdf
    • http://gdlianyu.com/uploadfiles/file/xovusufopiforaxe.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/s6oc61c295o7gekta7hd81gn2t/29744962806.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/govef.pdf
    • http://cana.vn/uploads/userfiles/file/wudomitajalujowo.pdf
    • http://architettogherardi.eu/userfiles/files/gozifaribokulu.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa7bc7450---59241479230.pdf
    • http://pretaporter-pegah.com/userfiles/file/63584529294.pdf
    • https://hatinhjobs.com/upload/files/39238070193.pdf
    • https://stonebuild.bg/f/uploads/files/2827858598.pdf
    • https://superpart.com/files/piximisew.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ucunsddpg3h299gd40lr9bmd3e/zixijuw.pdf
    • https://shen-su.eu/gfx/userfiles/files/muzarelope.pdf
    • http://joeun-it.com/userData/board/file/purof.pdf
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/80927236404.pdf
    • http://gzcil.com/uploadfile/files/gelugezutidijomidabesav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=luca+torrent+magnet
    • 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_off0000bd46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD46 16792 bytes
font_01_sfnt_off0000d558.bin
77a548049ab39e21839215cac9a7f59dc1f8ca20140ea1aefe305ee5f820dee1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 16764 bytes
font_02_sfnt_off0001008f.bin
5eaac479f3f8303b66b2326d6f01a5130fc059ca2b64bdd392b3abbb5372f3c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 10324 bytes