Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1dafc50a0ba82e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 18:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abebd85e30294df085c01b6b805dff32 SHA-1: 014d5933ec61275cf8574c2faef05cb68dde92d9 SHA-256: 5b1dafc50a0ba82e0c4bced99dbb157952ca2b3dc8ab558518fa6b6a965d0f91
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dadesigning.com/daduserfiles/files/sewebezimilajoje.pdf In PDF document text
    • http://slkuang.com/v15/Upload/file/202192652164014.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/43210255681.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/wajumibomazivij.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/sijevuronil.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398cf408473---serojefaxijex.pdfIn PDF document text
    • https://ka-base.no/images_students/files/64600485293.pdfIn PDF document text
    • http://vucert.vn/uploads/files/mofikev.pdfIn PDF document text
    • https://greenways.at/userfiles/file/52504537311.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1dbd43d42---vamawugififati.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/vogimanos.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021912230136465.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/nukamafagew.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a149656e---62136653120.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/bewomovimofodesodenilus.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc1625dce---gevivixasakibafetififomaj.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/37730385419.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/92494785227.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/kegidugerukegawubafa.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/dimaxijafaf.pdfIn PDF document text
    • http://air-con.ru/upload/files/69429714246.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/bepexosa.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/febufutigimewesudonik.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/97199158162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=midifun+karaoke+2020+downloadPDF 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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 10592 bytes
SHA-256: 64ec874142fddb6f037056920e8dad1653710d1c3c358cff963a675ffa5384f0
font_02_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 18064 bytes
SHA-256: 9354ca4ad846a1631efc553d8fa2aa81f80c85e7347f48d513c7b80fcddb9248

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