Malicious PDF — malware analysis report

Static analysis result for SHA-256 9feb0a10c58f50b2…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 04:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a2f787b07c15e4058043c24ed168cb4 SHA-1: 5d6a5555327b965cdfe6eb0997360496ce4390ac SHA-256: 9feb0a10c58f50b2dc34d18a4349a955f2c645b1588fc4474ef722ce121a18a3
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9323796be---48363602534.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3598b081d9---wulexeze.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/0b5f8de95e926f2a4b6a085db61771b9/65317905954.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d52c064e9---38937535900.pdf
    • http://topas.lt/userfiles/file/79218488592.pdf
    • http://jjburgerut.com/uploads/files/tosuvuxurezafudetanokal.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b20dfed9f5d---48755081090.pdf
    • http://chatfieldfarms101.com/userimages/bezaxet.pdf
    • https://ceccarbotosani.ro/userfiles/file/92007472949.pdf
    • http://alexhofford.com/temp/files/file/kopirodas.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b53626d61---9784156849.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a19b751b1b---bojofepokorusidevukipuz.pdf
    • http://azbuka-d.ru/ckfinder/userfiles/files/nikowojolutuxuzutesemu.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160904e36a3ee9---virezaduwomeronupimobufug.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097350fa7a95---56782928168.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56925df2a7---8028911262.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210619/file/16241014802023.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e91sr4m14j4n4m4pp72krcuto0/novozoragapoj.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/lb52i95b8nis005dtk37g6c8kb/winoxemonudago.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/65484436749.pdf
    • http://botosani.ro/img/uploads/file/morabonelapuzobuki.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb59df6ba---bavapanu.pdf
    • http://asbu.net/uploads/FCK_files/file/15283632581.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160def744c7947---70517358818.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e4885c59d7b---jorafadogamitexugapu.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/696ea53befcdfe5b20faa36ffbc200cd/webonakatoresamudozeti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ark+add+experience+cheat
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/4518e88754d82dd278ad21b3ed6a8ed0/46069818583.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_off0000ed6f.bin
2be0674ad608caa2eb17b6186eabe425e93f3ad5a504c6634e4368421a348526		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 17372 bytes
font_01_sfnt_off00011acc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 16792 bytes
font_02_sfnt_off000132e3.bin
32a14a1665d466fc2467396d6e48467140b2716c63b069c228ac290a36fe7013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132E3 10452 bytes

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