Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5ffff38a6ddd53…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 17:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 747a0d7ba770abb1cc9485a74baf77f0 SHA-1: 0a1ba3871116dd61f3190bda5e6d61dbf4a728ef SHA-256: db5ffff38a6ddd53ceea6e5c12ff7d8bb477950da538de63624128b0112e58ea
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, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or manipulate search engine results. The primary intent appears to be directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://krakow4you.pl/krakow/files/18324049025.pdf
    • https://miet.hu/kepek/24365407398.pdf
    • http://aj-freight.com/ckfinder/userfiles/files/nenadesexelaxuliwane.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd36bb10d---4245668331.pdf
    • http://turinhotelcompany.com/userfiles/files/38026629459.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac43f06e420---49827874615.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7fa8bd57776ee7e4fd02f3a617da36ae/51545293849.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609840e1a3448---78738161418.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/baxukatekewajawedab.pdf
    • https://anctools.com/ckfinder/userfiles/files/xusowibowusu.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607614233c168---41726953780.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c992146bf---gevewe.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a3cb2399f---43496156892.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/1c1bf5sg8rgo1ujtjnsl5gqc52/kulaxunanolagedu.pdf
    • http://unitec-egypt.net/userfiles/file/9616158773.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfdb5626a---kupesevaxire.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c16946b22ac---1009024697.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16080915ca2330---58518443796.pdf
    • https://kompaspt1.com/contents//files/xebama.pdf
    • https://condominiovillage.com/userfiles/file/77095639674.pdf
    • https://blugarden.eu/file/95494645491.pdf
    • https://kuzeyilac.com/resimler/files/wulotunatinukivimu.pdf
    • https://bistakalikotenetwork.com/userfiles/file/47889483464.pdf
    • http://airmon.hu/images/files/88569385592.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16114f0df8941d---pizolot.pdf
    • http://bong-dem-long.org/upload/editor/files/zokitis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cutline+c220+sewing+machine+manual
    • 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_off0000c0af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AF 16792 bytes
font_01_sfnt_off0000d8c1.bin
1f36e19ccaa0ac4aeaa925685e063722dca4cda1644e56d5ba87ca8b31a10c32
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 17080 bytes
font_02_sfnt_off00010576.bin
fdfe6b87b638fb711b998bc237297c693baa4866d90b8784233cd40c48ff5584
pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 10916 bytes