Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbd5848e50ec4c7…

MALICIOUS

PDF

88.2 KB Created: 2021-09-12 17:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 983c707bc25a2e351ef75ae95e002af1 SHA-1: 424fe5594a7029fb0effa8f7efaf0f7ba5516c5e SHA-256: 1fbd5848e50ec4c769482803e82fc267cedecf5bcdfa4cd4f6fa41ed819faa7c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs suggests an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=best+group+text+app+for+android PDF link annotation
    • https://stancijanegrin.com/UserFiles/files/pazejasarujaguzus.pdfIn PDF document text
    • https://baglab.pl/galeria/file/7245310051.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/40103908722.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d287adaa9e---mexogujowibomumejofi.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/sedabito.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/32188096449.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/66391458214.pdfIn PDF document text
    • https://kaimano.it/file/74601039099.pdfIn PDF document text
    • http://malifer.hu/upload/file/nopaxaweli.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/weliguxebiwigagopifixavi.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/debudano.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/kosukoru.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/37641430071.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/totoarj4hln98vgp3981lgvkq4/resulaxuzekibelolel.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/45236701295.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/woxajaxixe.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/96791694389.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/xenil.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/12932108748.pdfIn PDF document text
    • https://siroyensao.com/upload/files/foxepunofoxefavapogin.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/93831977424.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/99679598932.pdfIn PDF document text
    • https://edgecs.com/documents/ruliza.pdfIn PDF document text
    • http://erpos.sk/data/files/15681327713.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a9e7ea510a743e047d1004ce65010272/zatelogurotatamupulinodel.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_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 17652 bytes
SHA-256: d3f26b5c760adebf40d1271ab98844a3e79d5bc0128ec17420554ef2d9ea65ab
font_01_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 10880 bytes
SHA-256: e125eda65ed266b6f201e5747a10d49fca361ff61ad4be26a4121b7283b2b2b6
font_02_sfnt_off00013a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1