Malicious PDF — malware analysis report

Static analysis result for SHA-256 def458c7c122b574…

MALICIOUS

PDF

88.0 KB Created: 2021-07-31 04:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b0a4d724cbb66a6b497ad528cc38989 SHA-1: 28735950f844b01846dea83fade334f369819a69 SHA-256: def458c7c122b574499acff637926a548a25bd88ed84c5c06c7d4949a6bb4617
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/kktgcqo8gp2msavae0vnjmpl7b/pixovemaga.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba29df00948---tedudodom.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/vogivovowexisagis.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d939cd3d5a---57864347433.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c76f02ae04b1ad1a911cb7dcf1eb3913/85144226369.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/vumopo.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/83172165646.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ad9e216bb---nodawategarasuwozojet.pdfIn PDF document text
    • https://linardi.ru/files/file/kerunopidesomow.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/03e17cc9ab6115b057e584e1a9477087/24539313698.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d1a1ba4b5e4863ea598a6ca260e4002a/6614471420.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/12329885335.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dea19a66f---duvinasovelatolojekozojek.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/sovusasogepi.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/l6ei6cf06kk8901clnaptsl3ui/xeruzobofa.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/pulugeraxuw.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/lomawogitakepo.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/1161653498.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/52556117026.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/28176766809.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/aicppltgjmuuqj58rok0kur2pn/ruwaxazokekimupuza.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/17494704647.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ae8uloqol22467gq35i0phus5k/83099489718.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c144b1cc2d2498e6042d56879973bea0/mejijuxoxuremagetuzavub.pdfIn PDF document text
    • https://landbar.com/upload/files/95855893377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+verified+emoji+on+tiktokPDF 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_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 16836 bytes
SHA-256: deed924930543177a979c0ab2833da60231b382b275438a66185980e7be44e8a
font_01_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 10684 bytes
SHA-256: c859a79c717cb22c8a65eb696244f0371846c45183c6665c2b77519f82cf7e36
font_02_sfnt_off0001399a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1