Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce35a48f3872d23d…

MALICIOUS

PDF

94.0 KB Created: 2021-09-17 04:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cba5128aac364d13233915511c55c39 SHA-1: 7ed2fca60a4012d4163477651044f0feba6a9102 SHA-256: ce35a48f3872d23dae5b038ce42d71ba9acc8a2807e739683d520d439bc86c16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, some identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, likely to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://caythuocdangian.net/images/files/pikiwuv.pdf In PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/40566079472.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2ab8defd---medabaxegapuminoxe.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/36265165561.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/b1770b4069cac9cee1c3d68851f9fee4/zopumavarano.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/mizexoripaviloweroguxuwe.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/vajofugajaxana.pdfIn PDF document text
    • http://tykhchem.com/upload/files/72359115147.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/puditiri.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138211a2cf0c---todovikeponofub.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vosiromikinufonopamizo.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/jiduxujinapapi.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/86991308560.pdfIn PDF document text
    • http://acelybio.com/upload/files/vutevaxigenokokatapaniri.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/nuvofovelobusisukonajoxo.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210917084759_zoj1ts.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/namuf.pdfIn PDF document text
    • http://medi-sen.com/files/files/tidaka.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/kuvulajutuziwuroxipuza.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/56834953456.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/26215205883.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d8739458c7d642e6ab5742e27e368d93/96702017928.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/rijet.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/womorolomuxevizamigafew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=descargar+futbol+callejero+para+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 18352 bytes
SHA-256: a1b7c47b773907ae73db1d2801e6eeb5fd6df26e3a9dc7ba5fcfbdb1bbdbe06a
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 11168 bytes
SHA-256: 0e2ac47aa9d94b162eec1853e72d00032221d0b7564e35b949a071cb61febdde
font_03_sfnt_off00013a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A89 18708 bytes
SHA-256: 4172c229a95bd878e0376a681ce69e663752360d2443502831f88c1f33b1a21c

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