Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc32a877d6723fa…

MALICIOUS

PDF

125.3 KB Created: 2021-08-10 00:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 11c520881db74d17431817e90dc8fb89 SHA-1: c527643fc857cd18f1e9cf439d26159e47956f70 SHA-256: 0cc32a877d6723fae57163dcd1a8a298c777536359cd1f03b12453f44e7a213d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing or trojan delivery mechanism. The presence of external URIs and link farms suggests an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pistant.ru/uplcv?utm_term=how+do+i+set+the+time+on+my+relion+blood+pressure+monitor PDF link annotation
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f118446a3f---99691102429.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/c8pa7vlm7o77eoghlm80lgi5pu/22316577984.pdfIn PDF document text
    • http://temple.mo/userfiles/file/kiroxanuruderamojitu.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607378a290811---mugezusik.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/6487707875.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/korat.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/au55hg0oov4lk82nggsblba4q0/31508928632.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/95609510733.pdfIn PDF document text
    • http://camonetinternational.com/files/file/85101627697.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b249bbca2---25709921470.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b134bb379---rezumirokaderivitit.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b60eef033fa---kuxuwanu.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/86327238224.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073354e77387---rewewi.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/89947676817.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/sobiperematisonanujegi.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///37912424501.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094821677cee---bewepinejuvarijakeb.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/wepurekumaxomuz.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/bb62e11e7f47cc900255b7208968051a/regunowokisatodidux.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/etme36v20pn90tv6fe7m9hchn3/15993182158.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/953cedd8ea5b99323fa31acfbcc44bd1/53812501077.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/wikapozinaxegim.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88499e2c6---63875882737.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_off00018446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18446 17924 bytes
SHA-256: c20c7f8ab633b1b19bffad9ae952bff0c8dad16ab9a61975a16a0a88a5de7167
font_01_sfnt_off0001b3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3D3 10924 bytes
SHA-256: 80277acb829163b26eb51d75ce9346effd09a4bd613b781735be9feb418ff411
font_02_sfnt_off0001ccb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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