Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b73994ef7a4040b…

MALICIOUS

PDF

86.4 KB Created: 2021-09-15 13:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2e173af1296082f3a9a24d8b226fb7b SHA-1: fd4beba4c04467663881c0adf74c493f91ecbce6 SHA-256: 0b73994ef7a4040b0663b781ba6af3c0dc5e5cf318fa07ec0414853521b5b1cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef1d9960f---70965842045.pdf In PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/zulubivijavor.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vewisisesad.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409dade0725---kejifekositit.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/98052415957.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/41118783394.pdfIn PDF document text
    • http://snft.ro/media/file/lakakopelorupamomofab.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/sizekiju.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/68154739254.pdfIn PDF document text
    • http://vitrine-prof.com/files/44448937491.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/tubig.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4c6782411ea62d33f65b347038ffae6d/wuwufuxagekadawunaro.pdfIn PDF document text
    • https://protrialse.eu/files/files/tejefir.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/41422584007.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/sukogeduberuvim.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/pedidutukelufufinupivo.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/mijazu.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/dubudonurej.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613487fa3c540---35769144017.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/70700279227.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/75259472912.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/imonopuroxor.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/98233386667.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eddc8d7e84---37392521437.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/bebimegexefegu.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/51457812232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=most+expensive+android+app+in+indiaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 18280 bytes
SHA-256: f02d722de12a970386d2d86e2d931a1680d02728def4e0093d8c4e02711431d3
font_01_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 10500 bytes
SHA-256: 266e03c9d70f97c923b4ffdb40560318d1dc26cd71c3ae26f60514bceaaf06b1