Malicious PDF — malware analysis report

Static analysis result for SHA-256 3097d6f2e9ca83e7…

MALICIOUS

PDF

87.9 KB Created: 2021-09-19 15:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2069483070bd28a4b5ef6cc3fab3c1d SHA-1: 98362e3ce341420d52dfe4f0fe9acc7cc7d4d497 SHA-256: 3097d6f2e9ca83e7f51d96e231a88b7509e6735bc3fb2bc6901e759dd7b73970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=android+chrome+site+blocker PDF link annotation
    • http://ondrejkocar.cz/img/file/vanojogoru.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16143bdee66ef7---kenaxobijifawuwoxe.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/kibukipelazipiwoja.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/9058944942.pdfIn PDF document text
    • https://arendic.cl/files/32943876411.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/fakewatuw.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/9029339829.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/wamopubozesaviwudisi.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/63348134636.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614695a03c28a---bilame.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/jupememeneman.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/motoxezenodulanem.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/63394461794.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/relumeridig.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/78508411413.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/zilagipufegib.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e38de7ca36---zajiruzawunewavusolu.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jesogesinafenopow.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/zawonanakorosegenepe.pdfIn PDF document text
    • https://soechi.net/userfiles/file/12025826569.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/nutiwuzivedig.pdfIn PDF document text
    • http://vtaky.sk/media/file/wepulan.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/poguxesumado.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_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 18432 bytes
SHA-256: d54cffe60948315da5a5f8f79aade016264d0c4227853e319a7ed6d0f4220100
font_01_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 10684 bytes
SHA-256: 4cb1ead191ff4336dfc4905155942605105c6677da8e1edc438073f9cd081b54
font_02_sfnt_off00013820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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