Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb448787148c6c4…

MALICIOUS

PDF

72.6 KB Created: 2021-09-08 11:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 198081fa9020243fa2fc40d926c99266 SHA-1: a951ea91def7a00b944a2dd0c2152a553a1d1d9a SHA-256: ffb448787148c6c40153efcf27e8c1322b8f8614d8d439ce093ccb6efdbf4f66
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm pointing to compromised websites, with a high ML score and ClamAV detection confirming malicious intent. The document body is unreadable binary data, but the presence of numerous external URIs and compromised CMS upload links indicates a phishing or malware distribution scheme. The primary attack vector is likely spearphishing attachment, leading users to click malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crewmak.ru/uplcv?utm_term=adverb+phrase+worksheet+pdf PDF link annotation
    • http://sushikyototogo.com/uploads/files/48791867364.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9garrehl1aod4lt7ml3k43136d/tavakuwasukusutonipez.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6ac8709b973a3f786bc0f5e11cf68f1e/90782991981.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88adb035c---582559186.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/godudakobejulaguw.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/bavameloseniduwaniv.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/48987795642.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d43c5c004---48022812433.pdfIn PDF document text
    • https://ferropula.hr/files/vodez.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/94184945449.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/21766047260.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/d0fda38773382b1567a251487c80be20/21447100446.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/piradewegunewepif.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/61254982227.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44b0acff1---7133527837.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/xumuketon.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/kekisera.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/5243256163.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/18751672260.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5bd2291c171d04293622b5cd158a832a/sojutu.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/zopepakunabokegaraziv.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/efa53d30d2ce8ac923df5d2418ac5978/92991744932.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/54052889d9753015ce6adecea0379769/57273281099.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 10716 bytes
SHA-256: a733981a114744e89027a11624c14d10df28c1bfab448c57b6e583acad93a4d1
font_02_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 16624 bytes
SHA-256: 7abd5e70e358692f91f4e80230db99e003e7f2ccc7af5f9e997f5dd967ac83fb

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