Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1c746e954fb330…

MALICIOUS

PDF

89.8 KB Created: 2021-07-24 08:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4151cf9cc6eeb1c7f17e25319e9ac0f8 SHA-1: 86d13187e92c97ba5bad653715a361b42f5cf76a SHA-256: 5b1c746e954fb330ffcaef20290fca9ac8d02dbad0e2709933e83c021e26da3f
156 Risk Score

Malware Insights

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

This PDF 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 numerous compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://csc0532.com/userfiles/file/20210609024900_iwtj9c.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/tidemq5nguahrhjllv304dbs4h/veresokuwajifodel.pdf
    • https://arte-salon.ru/upload_picture/83632087353.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ti2pjv4k6pnjh94simsf1c1742/29517582046.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607053f3ada05---femotew.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42e81337ff---dafuzif.pdf
    • https://clifestyle.net/uploades/userfiles/file/rilejiwuvuzugerego.pdf
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/27437882484.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef331a645---bulimanutufajitalunasax.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a60932e33b7---52362976610.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb45174a96---93191854543.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b597d09047b---xapuwefimokufakosimasi.pdf
    • http://geose.ru/userfiles/file/pipojojijimewupipaxov.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210718/file/16266309906900.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e69d5b149f5e7dd2909e408dca7cc63/warole.pdf
    • http://seoulsquare.com/userfiles/file/gopan.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b32d7e1d251e53e44a3db355bff7ab09/muzupedavuralaxum.pdf
    • http://baraanduliaptti.org/userfiles/file/3333902564.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/kirobuw.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91cc236cc---83886290120.pdf
    • http://atomiccm.com/userfiles/files/fapogagax.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/8e1b0eaiemjfi7ndi759t0mglj/72491080613.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b9f8788e---46512240296.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607774b48d6a2---kumadikedopaselem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+con+los+pronombres+personales+en+frances
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kanolixasiv.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_off0000f4ac.bin
467fce3f291fe4a43489028977d2651458098d0094c34f5c164121a209a30bc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 10796 bytes
font_01_sfnt_off00010d33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 16792 bytes
font_02_sfnt_off00012545.bin
0461b7b883882225ff9bfc3cd21c22dc40642394e2b92778c57323df6e57a064
pdf-font-stream PDF embedded font (sfnt) at offset 0x12545 19692 bytes