Malicious PDF — malware analysis report

Static analysis result for SHA-256 812626657a814f0d…

MALICIOUS

PDF

83.4 KB Created: 2021-08-10 21:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1fc0ee4e1e3d21ad91a5b123470414eb SHA-1: a796927f8e20c82bd2627b94eecb0c492d29f6ae SHA-256: 812626657a814f0da9d7d70d0bfc4711c603d4f3c8dbc7a1998ee1483c69b955
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cartonwrappingmachine.com/userfiles/file/zivufe.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d26c7cd784---24434687530.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/kojufapimulavurur.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4784f52882da0abafbdd81c6b56cc5ac/52339288961.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fexawikeradele.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c54861147bc---pufewaxevuten.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/1sk7975vhh9pkjmqmilfb84tc1/94472705076.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/35227061134.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/63296826845.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/danes.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/m7lkgtpsk2pe0nnsde6ej42auu/83470478027.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5ac3bda37acb538a17d17b71966184f7/49275934158.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/66548254093.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/56151414180.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/33539469734.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5ko5jbtb039ugo9hhbgetaahae/61466907099.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/71945056123.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/43474907657.pdfIn PDF document text
    • http://cutskytools.com/d/files/25560064302.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/42439733115.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ab763bc322dcf3415e3dacfd0b00ebea/7495696039.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/12008299313.pdfIn PDF document text
    • https://ovalpolycoats.com/media/75319022693.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/54755716261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=atoms+and+ions+worksheet+keyPDF link annotation
    • 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_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 10740 bytes
SHA-256: fe67c2e53dd669d938b0be376310077febecf4769ea051881f606bef7bae8568
font_01_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 16560 bytes
SHA-256: 7e0a4f2f13aa0ca433d3ecc16d1703601a0f3f90d10408bbc80b564468f63782
font_02_sfnt_off00012707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1