Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35226ac79351fbb…

MALICIOUS

PDF

84.0 KB Created: 2021-07-20 01:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24377050c9c15c4fe9f2b3bc68ff405e SHA-1: 28ea76e49c15c60c4edd14c1b006f6bcf97e2ccd SHA-256: c35226ac79351fbb1ddf8e9f1b794cfdad0a1df3cb99013b9f746363ea131fe6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16079a385e8b64---1286405408.pdf
    • http://www.tekkoo.net/images/library/File/73540104388.pdf
    • https://noddy.nu/images/file/16246351789.pdf
    • http://tipsclubcr.com/campannas/file/47789875185.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3573fffb---mesavutixusavodofig.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210706_2B1A9017BEC0500B.pdf
    • https://puppometalli.eu/file/kavotib.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718ae533a64---mudibuzebujidewujefapu.pdf
    • http://sllight.ru/design/img/upload/file/puxazegavepizora.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16070363d6686a---repivuvifuj.pdf
    • https://betalinktech.com/blmedia/file/fewopinaji.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608327afba3ba---gagokifutikanosi.pdf
    • https://kisikana.hr/userfiles/file/37605637645.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc7a114b0---44789561349.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a134acbec95---29887594938.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf063d28b44---webofesizepogotajumadopob.pdf
    • http://rgn2u.com/userfiles/files/jemufezut.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9541935d8---guwerav.pdf
    • http://elesi.eu/fichiers/files/wagopefaxuvupogaxa.pdf
    • https://aawyx.com/sites/default/imageuser/file/xujepumulati.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6cefae9c4573511bd0d879d47f68960c/xovarekegisekubibofamexa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rubber+recycling+process+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_off0000e5e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 16792 bytes
font_01_sfnt_off0000fdf7.bin
46bf643fefeb012ff9414b08c58fb74b13e18ccacbeddac34b0db2ad41cc4486
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 17024 bytes
font_02_sfnt_off00012a48.bin
a925b0b2dce1424d2f8d03b40f03c4c6a083e9e2c7678b11803ba4523adc2311
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A48 10936 bytes