Malicious PDF — malware analysis report

Static analysis result for SHA-256 451d3c2530764177…

MALICIOUS

PDF

74.3 KB Created: 2021-07-04 03:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17bfdc58778ed5e25bca8d399f81a92e SHA-1: 655f06783615d26349c7d25b72a3dea1e507ab5e SHA-256: 451d3c2530764177f5cfdcd99af43fa04c7aa378c7020f6a13a2b380eff2d873
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://studiotecnicomartani.eu/userfiles/files/nusekugijezuwub.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160942ddb27720---gesonisagu.pdf
    • https://giustofiori.it/file/kikikim.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/676f33639a6cc1820bf58198a5deb5fa/tutasa.pdf
    • http://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/64010187698.pdf
    • https://mosconi.net/userfiles/file/56840140389.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf4c72be1---97265893494.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b23e320cf7c---javerasipibemegezawulaka.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/60520576182.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48d4944182---lizavumomubixuwafemav.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/md6srgf24el10f76c4ejguh9o5/sonuwebalupuval.pdf
    • http://etasystem.net/userfiles/files/punototav.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/83429108a78d89027536f87b598b7b6a/dakumanusalupivanifigakab.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc21518b1e---xadogivasudinugupew.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6172fe5e---60651933159.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7360733fad---69239721536.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160cf98287f15b---3445391931.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9481e9705---luxegidesij.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c588ee0d---zubexadusesoziji.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160757cfb6993f---dijuxime.pdf
    • https://xehowo24h.com/images/ckeditor/files/xipogivofefola.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/991e646f337352712d4c37a46807dcf7/gozimewezig.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c5a864320---wasunabafopujuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=important+search+crossword+clue
    • 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_off0000be73.bin
819af12d9acc162e5028fc5f68be39608f742f1eebba519d669b787997123ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE73 10824 bytes
font_01_sfnt_off0000d744.bin
3d47c45b8051ed1129761745e2a51dc45504628e06fa24315fa1eaa1678c22c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 16656 bytes
font_02_sfnt_off00010240.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 16792 bytes

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