Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f51f64aab66d60…

MALICIOUS

PDF

102.1 KB Created: 2021-07-29 22:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 403119847d60101977d9a1140c1b3303 SHA-1: f7d644ca1670fa796a222f748896065d2c08c4c4 SHA-256: c1f51f64aab66d60ef7c41ca16b6eafdf4de5a8cbc883a6c54a96090d74ebdc4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://pixomot.ru/uplcv?utm_term=ganar+diamantes+gratis+free+fire+2021
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/10bc27ad48b2b4395a8bf56669f6f1bc/73367853843.pdf
    • http://ehomeforeclosure.org/images/file/vejuvaduvafufujoxafufugit.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084842e8d200---nunesebuzupanomok.pdf
    • https://jkmart.net/FCKFiles/File/31985625124.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2mvtirnuggjjrrs0mqe42rcsei/xejejapafexatuwej.pdf
    • http://thomasbelldescendants.com/clients/40432/File/542508724.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b9194fa4354---mukizunajedobuferugawa.pdf
    • http://benthanhsgfarm.net/images/uploads/files/60756353834.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/10c767b8d66fcb6ff803d878de81f666/18207928548.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/86b686105099b3351233e684ac558692/23934434265.pdf
    • http://loveperfectionschool.com/upload/file/wikifatazeri.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/623cf156adf054527d22033652e47133/korewifakozajolax.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/l7m5sad0gktq343nlsu5luij26/65133310365.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/41e97cb915b7a2ad140825ef2eaa8243/bagazazowoxiwisubo.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/9nv02o4pahihlq93kh1c1pbnsj/zirusas.pdf
    • https://infoenergie-loire.org/userfiles/file/zaxowot.pdf
    • http://copy2d.com/ftp/image/file/59167403995.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9a2974d5---17506269380.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/0jho05b39ca18uvgqb139ct3im/mukagusotumodobed.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d332c2d8b499f3658147a1e74da98563/resojo.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c7c95c8ad---bofozarolofurokumurad.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/d64tr0v1masuuj7cs6k63mbrmj/nikifoni.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/73046232567.pdf
    • http://langeline.com/ckeditor/upload/files/lofepufisokofu.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/db5330f76b6c962ddbec785c1099ca98/59324206716.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011039.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 16792 bytes
font_01_sfnt_off0001284b.bin
ae2078f03e229168eac5f9d4856c8f9779650eb240e4f7f76a1b1827d02e92be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 18828 bytes
font_02_sfnt_off0001583f.bin
d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
pdf-font-stream PDF embedded font (sfnt) at offset 0x1583F 16488 bytes
font_03_sfnt_off00016f2c.bin
f8985043179c9446e3bcbdb16dc84317bee94a6feb24c6af92c26a5191e7a009
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2C 10864 bytes