Malicious PDF — malware analysis report

Static analysis result for SHA-256 8739dbfacd6a176a…

MALICIOUS

PDF

85.8 KB Created: 2021-07-01 18:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 498bc15797d88ae89953564520b663e1 SHA-1: 5dc205d164bc3f1812c09bcd6e3ef6c00cd3ea4c SHA-256: 8739dbfacd6a176a72e341f9b443d5afe439f75d638b598d3cdaf2beaf1f6c62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/4cdd19ea9d01f2eb436a330810f7ddf3/wovabujazepejuxikelus.pdf
    • http://agendatourvietnam.com/hinhanh/file/fudutojo.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ab934976---xovudenuroditukoxiwi.pdf
    • http://historia-bfured.hu/userfiles/file/77731223372.pdf
    • http://mosjob.ru/images/file/jalojud.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd527b217b---44926023375.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb65a9d11a---87315763009.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097bf8714e33---fopupadaxeju.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c61608b7de1c5a811077c077af35ef5/mexojapevupasesodikoma.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1c55c9cae6fb3425137885342e24c34c/mudekubovomumexugox.pdf
    • http://aitrans.org/UploadFile/file/F1202105121807458605.pdf
    • https://aronabritcan.com/userfiles/file/11861923336.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/75dd1f72e3dc9a63593644ca039eb9bc/kikob.pdf
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/46763043749.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd8672c563---noporilozixowev.pdf
    • http://okuninka-biale.pl/userfiles/file/76972754488.pdf
    • https://zebcom.in/userfiles/file/juvefetawogisufiwarox.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607f58fa2fef7---likisulalejazeketam.pdf
    • https://cplastik.cz/data/cms/file/tavekajigiwe.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608153d9183b4---12652480828.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b49993d7076---bunox.pdf
    • http://ssujaxchapter.com/clients/83257/File/filixenukejenede.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f400399d3510e24458a4d3ae98583a87/wenesoxevuposujupokomenen.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1de311d83ffe61315fea0227dc32de92/refefikiweroxif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=which+transmission+is+more+fuel+efficient
    • 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_off0000ecfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 16792 bytes
font_01_sfnt_off0001050e.bin
549f9e4c07d4fad07f30cf310e81bddf11516f626416c1ed3367960cfc5092f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 17060 bytes
font_02_sfnt_off0001318b.bin
8d7384c4fb4727bb42fa3d5dad4d7b5c3fb8525c2262011d0bc012dcebeb6d9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 10692 bytes