Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c866a2df1cd5503…

MALICIOUS

PDF

227.3 KB Created: 2021-07-02 11:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1dd23076bd4205f0413928c9527c4db3 SHA-1: 4303428bbacf2e800a127027796729c10f14d3f2 SHA-256: 0c866a2df1cd5503faa58025b14287166f128ed4ad7f0ec4a4ad9d16948cd000
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains multiple links pointing to compromised websites and redirectors, suggesting an attempt to lure users into downloading further malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://dzbnf.com/upload/file///molevi.pdf In PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa373b607f9---3967960148.pdfIn PDF document text
    • https://limsurdua.com/contents//files/44245279892.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/ginij.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c2be15baec69e25560798c80601e8486/8777397834.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e244978bbdb935204a3ce230635e166c/ravojukupazomezunol.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/23202017934.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d438e2c938c---sevigivojapu.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/filepanitovifomusaboxo.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1c552426da24ffd292aa857be6480598/tixuburulawubibu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d037f2ff1b---pomefalodadufafufidof.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab3850fbb---30005522156.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c120da9074c---zixogivi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a2484254f---78434417393.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aad629e4d---30331590724.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ce160a1e---30977005791.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/009ca47d613acd2a788b899c70ee4095/nutokomoxurigeroxax.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/ziponukizojowef.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/aee6aa781dd149d5d4800ed94227f9ef/85888821177.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af93acab21a---80788633267.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/bd89e251b5cfdc66215032039d965093/5321309986.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1e6d7cbd4---78936485721.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/pigiwegotemotorimovibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=divine+trinity+meaningPDF 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_off00032290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00033aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33AA7 10296 bytes
SHA-256: 83aec74bb9b26b2b213c9012f4dcbf3155abdb8c3f3c32b6c638222ef380bcf7
font_02_sfnt_off000351e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x351E3 17872 bytes
SHA-256: 5cb705a0166f3b51de0c5e8fbb710fcedc20b4979452b63530091daa06af150c