Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb66bad7fb597f4…

MALICIOUS

PDF

76.1 KB Created: 2021-07-03 17:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f95d0de0511df82ab89ba22a072ab7f4 SHA-1: fff0961cd958b8a23c1eb9fc766b1d4e10eacf7b SHA-256: 6fb66bad7fb597f401019479293ec6f0025732980cf2c33f825c54dfcbee6a84
180 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. These links are presented as a link farm, likely intended to deceive users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=agcaoili+land+titles+and+deeds
    • https://daks-96.com/f/uploads/files/kisadatemoganetowa.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc55c2281---45714679261.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/h147o1vth722tg3vajlql5mlhk/23359130108.pdf
    • http://delannahotel.com/user_img/file/84030693564.pdf
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/kuvoxez.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e888f25d5f---buxax.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/de8797f1ad92f5363f68a0978342a4a7/54778407493.pdf
    • http://mextro.de/upload/files/ziloxogutuvi.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f1f6c83b4b9deba29b800bcea3b283ee/57583252527.pdf
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/160801b83a8782---53330694615.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608022dfcba5f---25267455988.pdf
    • http://tasteofruraleurope.eu/upload/File/zesisularexavosedowumud.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/wefudinizebomumilapila.pdf
    • http://slsnn.ru/content/files/pokejikunufonono.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5f41d7be603f425a39401a6004aee012/55464706935.pdf
    • http://xpressup.com/userfiles/file/buwozud.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a36a9bc6---mokixulugos.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/oc0j4m1755simajvtdfgjkmkm4/mawomafogisovovuj.pdf
    • https://csodamalom.hu/files/files/21120788605.pdf
    • http://springbook.no/files/4656347978.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/502046219c2e380a805998328f0fc033/46807624123.pdf
    • http://614move.com/clients/4890/File/guwolatevutugibalisir.pdf
    • http://didaconcept.com/admin/fckeditor/file/vapenorapodijo.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/putokiloxif.pdf
    • https://hosvagyok.hu/userfiles/file/dozagadopiwofep.pdf
    • 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_off0000c775.bin
da693a490c45d502fb7b046ba3caaf2640313d7cf15951255466bd4a91fb7b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC775 16852 bytes
font_01_sfnt_off0000f392.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 16792 bytes
font_02_sfnt_off00010ba9.bin
054e26eb684938cff76c8601f4f33a1d162d22f405506780ca1c64e5866bdeb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 10428 bytes

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