Malicious PDF — malware analysis report

Static analysis result for SHA-256 914c81786d8ea781…

MALICIOUS

PDF

80.2 KB Created: 2021-07-21 05:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2db8dfdf9f0e245986cff57e209d24b3 SHA-1: 9100de943e8727352c1db8720a653b5f7cce9ac1 SHA-256: 914c81786d8ea781cce289708e0eaa95d9cb2d8dc2f0d01daeb661771c3155b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8vpr9nfsh832hnofvloep09lja/24280158645.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f16d937dcf2---febofalezed.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d5371e48---digef.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/dakipopilakenivevox.pdf
    • http://brandnewgoods.net/userfiles/file/pidamapunodemilad.pdf
    • https://tort-art.ru/userfiles/file/pinatifipijameso.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/20726588012.pdf
    • https://promise-land.com/upload/file/48679286657.pdf
    • https://travelsafeway.com/userfiles/file/gokofetatepapegatunawis.pdf
    • http://malagi.pl/user-files/fck/file/61882612897.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608afabc2d859---41466815402.pdf
    • https://jamisonfurnace.ca/userfiles/files/97150576366.pdf
    • http://www.knickmeier.net/images/pageimg/file/ninabebatoziganapafipimom.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/rtainbq8ooclkd60p8m4bnqb9k/tuwutawagijej.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088749c74bf2---lesiworusuvolerekud.pdf
    • http://recrute.fr/files/files/webelajetovup.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aacf1c8c79f---waxogitosi.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848ef545643---gavefuweluvi.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60562806---zopenopetubaw.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7f82783991db7a111d59559317653539/95218922518.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/1625333069518.pdf
    • http://allasclub.com/campannas/file/faropinozonezinuw.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/mvjuoiv2dgkvbsoo523joo9tqf/bafawujazobofokugiporivi.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dpnu80t7ojgi7rk6ag06ki29kl/rosuzor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fort+indiantown+gap+cemetery
    • 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_off0000d633.bin
ce2805c7e8cdcf22a62c09fa7bf6d8f68a18696d1760d2d1403afcc335ef663e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 10820 bytes
font_01_sfnt_off0000eefb.bin
15622f722d7b73a4ad9a28040ea9ca8f3964963d5ebe94324fe706e398ad1e30
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 16488 bytes
font_02_sfnt_off000119f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 16792 bytes