Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d338c4ddb9c4ed0…

MALICIOUS

PDF

85.1 KB Created: 2021-08-21 19:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 83c4a5483d334f3325506935f7edc67b SHA-1: b6b582b1f994f989808637e5bc8d0ee4e3058210 SHA-256: 2d338c4ddb9c4ed0b1ee670f98e78c4cb1b901d3df3885058e91f53ebcf27979
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous embedded URLs, many hosted on disposable or compromised domains, strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://clinicscrm.com/img/files/97506249005.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b03ef3c5697---7031698275.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/388694103.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/79594065422.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/mibulufuvilomenusuk.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160718b3a69441---16783529282.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/ridalawejage.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/fimaxuditaxobememuliti.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bb71bc8429e70e3e896d6b61cd5a7899/lorajedaworutokemos.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/10434227871.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/mexan.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed83532f4a3---80891267879.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071047d7b459---15052651377.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/xoluvig.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/resiporolosinozet.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/48999490796.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/6524249719.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9707ae1305---48546236054.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/34129351674.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/sekizekimedopisogakuboma.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/gunipunenegitedepixaluji.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/c1mq01tu7t6p7r9ga9aas21ah7/nifofa.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/rawafuwezim.pdfIn PDF document text
    • http://vtaky.sk/media/file/76297088280.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/sogarudumitab.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/56803586920.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/19417538235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tabla+de+valores+de+electronegatividad+segun+paulingPDF 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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 10956 bytes
SHA-256: ef3487557b7c07bbdc8f1cffd73b2cb95a2c9e4a0dcea43d2b5f1ed35a496ff0
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 18760 bytes
SHA-256: a3578b56bc7195f316c04c0b7c0f8eae59671ea8b064674269db88ac1bd12a94
font_02_sfnt_off00012c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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