Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7dde8f963398bc5…

MALICIOUS

PDF

77.1 KB Created: 2021-07-01 00:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37da31a639f1c255cf83c9c942f223b1 SHA-1: 22c46ca1fb3c457bd0bb77bd740826eeeba2176a SHA-256: e7dde8f963398bc513ceef15b7f5f4a670ac3d15550eb4849b19616803f033a7
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The presence of 'utm_term=send+money+fast+and+free' in one URL suggests a potential scam or phishing lure.

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 http://hasici-pristroje-eshop.cz/files/file/wejidax.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1da9fba6---togukujife.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7a61ec08---koxedawizomusanumewofoko.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/45b7cf3756bd65ed775b08c2fafc1f75/ruwadosi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edbd5b8299---50590191645.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928a2c28c17---66186612335.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5to22bq68eaisb5oqdpq1djn27/61383107408.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098af6e9aa32---boxosovefulurunin.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f041b124cb---65789126935.pdf
    • http://madonnina.info/userfiles/files/xabifurawevidix.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e934d9fa7c01419f6fc089ca8ec42203/15764519887.pdf
    • http://aliceinformaticasrl.com/user/pages/vikisikuribakul.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816a7240d34---29740954174.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/24328223769.pdf
    • https://pharma-tools.eu/galeria/file/vodilifakonamapujudega.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fdifktt27hgdcj212hf2hcmhmp/juvuvudibu.pdf
    • https://marigabung.com/contents//files/xiruzegaxe.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a3742e4e68e81bd65cf38908df6bd301/22820852353.pdf
    • http://bsbcarpet.com/userfiles/file/17674975455.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6069147e---soratusidobosibe.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/s4fo8a9ad9enrfqi7b5gfacobl/mexofefuruzakuzuvajejofa.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/385d68612f449cf51da126450af9ac3c/rinazuvemonij.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb7020c061---91922945189.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=send+money+fast+and+free
    • 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_off0000cc73.bin
21ddb519551be37d8b7913e70b66f4cc840e0a095680047fceb9db75be5a796c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 16312 bytes
font_01_sfnt_off0000f6e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 16792 bytes
font_02_sfnt_off00010efb.bin
cdf7ff24c29b076c462c2ba6fcb28aa2f72b96050cde32f526adba414c2fe47d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 10568 bytes