Malicious PDF — malware analysis report

Static analysis result for SHA-256 be09ccf509b0d055…

MALICIOUS

PDF

86.5 KB Created: 2021-07-25 06:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5880421d0ae6cce8ea3bd10b3ad8536e SHA-1: 7340f4fb8d2f58fb5b62c9ed2d6f82076cfba937 SHA-256: be09ccf509b0d0558824183065e97cc3c01650eb3f36b6a400aac171ca388013
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/bt8cvmatsgicabgnh6ob88e1fh/xexugiguvawonarejegol.pdf
    • https://mfdesign.hu/files/file/jasomijixubakuto.pdf
    • http://summitremodelinginc.com/userfiles/files/zunixu.pdf
    • https://contabil-fiscal.ro/mm/file/mebexosa.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9471f43846---bovavunit.pdf
    • http://spc1991.com/ckfinder/userfiles/files/80106427704.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a10b971cea---3574063945.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc0c4d66a---34629201165.pdf
    • http://chapelguild.com/images/usr/nefosagekanosinudumib.pdf
    • http://tlxzkj.com/uploads/file/280406205006.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d586b5f7---judivajajatomewujogo.pdf
    • http://starke.ca/clients/84205/File/gofalotifijisedubiz.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c368d6a0b6d---newamimogat.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/tudapowawujudelunomuxos.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/b0uueit7hiaaet6v68e8tc2tm1/bapatebamolobozena.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c7f7b6278d16ef62089b817783ca6797/vemasutuwefinogor.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607861c1199d8---rasefagatunerelagiseji.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5db7efb6d---towipege.pdf
    • https://aartipalette.com/userfiles/file/98517259113.pdf
    • https://belhasasecurity.com/userfiles/file/57235275440.pdf
    • http://arcomproltd.com/userfiles/file/35204823117.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/vaxer.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b52e0fd8003a2058b8f363116ea8c1ef/sexuxabixogobum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=present+perfect+tense+worksheet+with+answers+for+grade+7
    • 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_off0000eb4b.bin
02d27bcafd94b06712798f176dc41d2404e701971095750b7ee40b837500b250
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 11084 bytes
font_01_sfnt_off000104fe.bin
4ced5830045daa6a84157cdf4107919685e8cedf33c1a46f33314fe256e2e1f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 16800 bytes
font_02_sfnt_off00013082.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13082 16792 bytes