Malicious PDF — malware analysis report

Static analysis result for SHA-256 4453695e8cba33a2…

MALICIOUS

PDF

85.2 KB Created: 2021-07-09 02:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cbbffccc9abba761c945905b370d76c SHA-1: be8424757ec912a2323dfa590b1d31a95f61a071 SHA-256: 4453695e8cba33a2a89a72ad45ae3074c8bf4a1d543d3218ba4c427d5317ae02
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and UTM parameters in the URLs indicates an effort to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=maybe+if+you+stanned+loona
    • http://bangdientunhk.com/upload/files/vaduvudoguveworegupiweza.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/7e1df9f9e53e86638fffef814b4f1e8c/nukulefawokimivebon.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6837c0c0---72809757491.pdf
    • http://anoh.net/pds/userfiles/files/35539710777.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941ef36e04d---15386258896.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160824c22a2af6---vakadixumaleratabilo.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/23fe0ea986f6c2cf4c7e35af9161a02b/75186549293.pdf
    • http://etre-belle.su/images/file/vegalimu.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/315e99b3842e13bd38ca147acd1a2848/71415964906.pdf
    • http://munnarinfo.in/userfiles/file/86287876856.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/87f12615321d329ceccdfec680b01156/velegewujajuwago.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf13c27fbf---vefaremigiviba.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ca8bfe3e3dbf97d350a6f53ae484c4f7/wogod.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/35df5159e9c37bfb51be21f8c0bf2bee/95504957865.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc9022ed6f---bobogonosezajotanezenifu.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3656bdc23f---81012491234.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/48f22844d7fcafd711dbe651ee50e280/98377796884.pdf
    • https://lawrenceyezersky.com/userfiles/file/10394745105.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3882aecb---2733893415.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/42d1492e012c7247295435974b9583f4/47196976839.pdf
    • http://billsky.ee/files/file/xanovajirojufiwiwijaxen.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0504b66826---salufosiletexenevum.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5o9njggb8sm3g34hqg855l51gv/sidog.pdf
    • https://lncl.org/ckfinder/userfiles/files/fumisanuv.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_off0000ea6e.bin
a9eb3282ef0a0f5e42f71b162c19bf180131ced343479dc899da547b0b19a480		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 10596 bytes
font_01_sfnt_off000102cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 16792 bytes
font_02_sfnt_off00011adf.bin
3014c6be8012e9cf3f146a1f51fb2c15a2914547000222051188e40a363f419d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 17088 bytes

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