Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db2c43cd07e1c0d…

MALICIOUS

PDF

88.6 KB Created: 2021-07-01 12:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6cc15cb0218c21a017498b1026b4cea3 SHA-1: ec61992b3bd0cdad8e9635c2834ab13ec4735ba0 SHA-256: 8db2c43cd07e1c0d319813804309821a52e49b92fdb81471eac82a04c7da9cc4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://krisoc.ru/uplcv?utm_term=how+to+make+slime+with+hand+sanitizer+no+glue+or+borax PDF link annotation
    • http://bainihu.com/upfiles/editor/files/selobev.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/388afdfbae094b5b0f23e80f02e81e3f/saxodurewibunokopa.pdfIn PDF document text
    • https://noddy.nu/images/file/xebesepezomuwuva.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071bedd5cdb6---34845461779.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/32170490079.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9759e259---7791228789.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4be3547b8---97664236661.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/73f266bb55b7e7c6ab78171fca54d0b3/42924276324.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/s17rmalijnogp82ia3h50ns4uo/59777492305.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/ziwugakilitaxuvejixamebuj.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1fc57dcb74694f00c6a6093cd94500a6/74573094286.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940398e6226---43611964414.pdfIn PDF document text
    • http://teraval.cz/res/file/12591283258.pdfIn PDF document text
    • http://tfforming.ru/d/files/45735012724.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/kujumi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae36e00d8cb---37720094519.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5b93bb13438ee69857216fb951d8823b/dinega.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e5638acb3---rutavibusinig.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1jdrk2pfp6gs7a76li0uif31o6/56107645464.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec720c2d57---pitixabimuxikizokejabuva.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/31a3981331d08ba9651b79eafe100c98/sikodotasowas.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bpd25ufa6efpam67461lpov4l9/radetaz.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/tolajabejitu.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724248299fd---metukofiguzavejufozo.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/tezidi.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/93898209765.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_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 11268 bytes
SHA-256: 4b1294a67749f39eb667c977676f9975a13142d25d7393e61348a25491c219a5
font_01_sfnt_off00010fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 17156 bytes
SHA-256: 81a76489ff5aa647c15e08429f126ed7bf4b0797182fb9289215b2841f1a0e2d
font_02_sfnt_off00013cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.