Malicious PDF — malware analysis report

Static analysis result for SHA-256 6384533171e48caa…

MALICIOUS

PDF

103.8 KB Created: 2021-07-13 16:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a07abb989a05b2f60af580af4f8021bd SHA-1: 756a38f911001780bef58f678f783ab7ec003707 SHA-256: 6384533171e48caa18941db21a71ca70662f2d05b88907b89870a0420ae35cff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it functions as a link farm to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4e30e283---30427070486.pdf
    • http://alternatifmedikal.com/img/userfiles/files/nujebax.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd9ffb3d05---juzemufafowivekume.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7f7041081e32a4899e8b1669aab70050/31938235344.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/db9319d9a69e265060501332d4ae0648/97941671207.pdf
    • http://www.radiooro.com.mx/media/images/uploads/files/kolinesiruzuni.pdf
    • http://kingbikeonline.com/images/upload/File/vowet.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/72357060388.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/b483jufboumrmr3evbo1j323h1/ludefenoxigesawuginigo.pdf
    • https://limsurdua.com/contents//files/xibetim.pdf
    • http://booklandbooks.com/userfiles/file/6806406835.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b640649e01c4fb98676f33085223bcca/pejapemogapajusedofidowe.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/6748f7ac99588d1fb5626716cc14b31b/gowedozisezoja.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf828c3ecd---1402904227.pdf
    • http://goteneplast.se/files/images/file/nezokajoxaxokabawimubo.pdf
    • http://prplus4u.com/ckupload/files/676177346.pdf
    • https://kingdomofgodmn.org/userfiles/files/55722193693.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc727fa488a---bujamopem.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00fcb8b797---52031154921.pdf
    • http://kfnmsz.com/upfolder/e/files/20210620012049.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a309156a3---zuwaz.pdf
    • http://bearings-home.com/userfiles/file/44773643275.pdf
    • http://ambvetfanini.eu/userfiles/files/90414184483.pdf
    • https://ratsimae.ee/media/contents/file/busizijovinokotazajesimos.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d4d7752f32c73165aec332bd741b25e/sudobezenem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=i+want+class+2+question+answer
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 16792 bytes
font_01_sfnt_off0001369b.bin
edc745641b806edce02870d0143028f2b60d7a05532031c6fe40c60e8372c8c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 17260 bytes
font_02_sfnt_off0001636d.bin
475ed9baa7768f3b977d0f9b03c9a6b8bf44768a59ba1c38d89a02d04588a1d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1636D 16080 bytes
font_03_sfnt_off000178a0.bin
c164db6fc8fadcc89b18f8fcf65b9ccfa1d4fbfc836ae159318883d7d7444360
pdf-font-stream PDF embedded font (sfnt) at offset 0x178A0 10624 bytes