Malicious PDF — malware analysis report

Static analysis result for SHA-256 677316e7b47e6150…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 22:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a2ede937064f6547e1491488ac3c496 SHA-1: 470683c2cebdcc1ea19c15a78153c4c9299db6c6 SHA-256: 677316e7b47e6150a9ac68ffa9e4f2798718673721667d0a4b3611705e195044
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. The embedded URLs likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e693973b---42456085854.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/rasodolofezubazobav.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/13j2ati7053dncd9ggej0jndul/jejim.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/fd678868bd9ea32031467717282af0a3/lojonixuf.pdf
    • http://pusancard.com/userData/board/file/31528466521.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b304705da53---rewexipajajakupele.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee9819e3afe8ab5a7e9e3f27889885d2/11091753031.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071040970a07---wamoxugoburagoditaw.pdf
    • http://bocghedanang.com/media/ftp/file/puzufelumawu.pdf
    • http://wtmongolia.com/materials/file/lamisul.pdf
    • http://artospace.com/pics/file/80037510720.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8fhne5rmbknuunn6rsflf6fj8d/25256902113.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/tgkuslq76na7j602mjlc94m082/mowib.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c10f2f9e619---53359669959.pdf
    • http://jkohut.pl/file/59974687425.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/29343719490.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d61824c0---wubafu.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6f69a685---vuriwolumivibuga.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3fade064---87497109407.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/1ad45053e3e9add1fb7270ab967fa733/99927206835.pdf
    • http://activesolutionelectric.com/images/file/81624371265.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c936ee745a---muwonogidugaputopimafugi.pdf
    • http://adabaskimerkezi.com/upload/file/96235402675.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa5c374cc---wagadopolawerizo.pdf
    • https://quangcaowebsite.vn/uploads/files/48988942100.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=is+it+possible+to+crop+a+pdf
    • https://ezgif.com/crop?url=https://example.com/source-image.gif
    • 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_off0000ef97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 16792 bytes
font_01_sfnt_off000107a9.bin
957d5f2d2638544d8be409676c71295f66e7761e8f93d46b0ad98edf42ded1ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 16808 bytes
font_02_sfnt_off00013362.bin
1d7bdab3541b4a5e85b1b507200b8414dba644c3408f40f08d87960d61d7aeec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13362 10600 bytes

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