Malicious PDF — malware analysis report

Static analysis result for SHA-256 668f1e762c057587…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 09:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c257c27ca447fcda3040ebf88ec217a5 SHA-1: aff32b46cb54a093330d63e80da51b71f945e7ae SHA-256: 668f1e762c0575873ef4c8bebb5b520f4b2ef3e4468ea78651f538d11691bc28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hzkontejnery.cz/ckfinder/userfiles/files/78792701446.pdf
    • https://turkihale.com/userfiles/file/varenikuzagadogusu.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495241ca34---31835189367.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098682a8e528---34091560665.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/dipalajopefifowofojewonu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d36e1bafb---69906544718.pdf
    • https://candbco.com/ckfinder/userfiles/files/74966609663.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160714bd249c3c---tajexibakud.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec7f47c8f---3919030907.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/23752711237.pdf
    • http://buddhavehicle.com/userfiles/file/bapufofopirimoradaz.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1h0jlom7tdav71vtlgvmvn0973/wudobuzun.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c1fc8a1b35741acbadd00f013ac89d70/dotajudekipib.pdf
    • http://koreaseowon.com/ckupload/files/vadazarem.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081397fdf2c8---vosujuwulanofelitid.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1ad8070a---92697185738.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a0ea68c6---sodimosekuzikeruwaleta.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/225fcf1643882a58a00ce2519d94ee9a/rilojutavow.pdf
    • http://coyada.com/up_images/up_images/77342946203.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0d858abe4b78c815201b75da99345d0a/8262336219.pdf
    • https://daks-96.com/f/uploads/files/33622557591.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160729262eb8c6---rasilatilunegubavumid.pdf
    • http://hy-concrete.ru/d/files/separedegovajirirakos.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/75p8b6rnot3903dsp068hb0a46/60827561905.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/t4gpi46ofu79engd76a0cbfp2j/81158110662.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=300+euro+to+inr
    • 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_off0000ed06.bin
df4ebf574162b845ddeb38a2731c7d2444eb4a9d3e8f4818056a67fa44f25262
pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 17276 bytes
font_01_sfnt_off00011ac9.bin
477424a77fea32aa4cd832db2b329752fdf089a1e482f8365c8cf78606510135
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 10020 bytes
font_02_sfnt_off00013120.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13120 16792 bytes