Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0e21af73ed6563…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 02:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19ce72c76e7cb12d5cbd6b61a14d5010 SHA-1: d1ec80ba325b2bd609de1789a7dd4c568d4daefa SHA-256: aa0e21af73ed6563870097cfe726eca27a372014a665b93fe15b0fdb886de2f0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gillsandgeckos.com/userfiles/file/44816630223.pdf
    • https://daismene.it/file/48239971063.pdf
    • https://ijieet.org/ckfinder/userfiles/files/96667816134.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607726f6ac32e---nezinofovavabed.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ec3b8c6868feb165a5424efa4f3da677/21059780898.pdf
    • http://yh-nutri.com/filespath/files/20210907061941.pdf
    • http://isleford.com/filespath/files/20210814123129.pdf
    • http://tofuyatogo.com/uploads/files/94079852793.pdf
    • http://baobiachau.com/luutru/files/sogazibuzumagu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca225ecd34---fipupirogibatofe.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc59561d82e---mivejularinivubilafilewil.pdf
    • http://nelly-design.ru/upload/files/27087573052.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/ridumogojekolufolif.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/778ecd1281defc0b964bba0484928715/negizeruwodoxupulafoxiza.pdf
    • http://yasaitogo.com/uploads/files/29515482117.pdf
    • https://stotex.rs/files/salajekulokul.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7a5cb0a0f---demokizumupenavafoko.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb18d2d91e---98301298333.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/widoje.pdf
    • https://studiopros.com/userfiles/file/
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fivebofakuz.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160befc53e375f---bujokerakowuwu.pdf
    • https://altonika.pro/files/fck/file/40121211331.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4195423e7---rekegilogisugiku.pdf
    • http://sanarina.de/ckfinder/userfiles/files/80020247231.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=letting+go+book+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_off0000df16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 16792 bytes
font_01_sfnt_off0000f728.bin
4fe3b0cd40dbea4e2b69c44df032cd69dd6dec345ff28a79383178bd3bd9f118
pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 18100 bytes
font_02_sfnt_off0001261b.bin
b2cc8f2aaf426729d340e9eb26b222189b05628e88393d9346f34e0bc710a465
pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 10388 bytes