Malicious PDF — malware analysis report

Static analysis result for SHA-256 e032e14e71bd2be0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 18:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 22132a4d0ac276ade3163e1bec354ede SHA-1: 1f7a097cadc319cf8592b140728943a7e5017e68 SHA-256: e032e14e71bd2be0b008cf2098c9cf36680eb64f10be923f022310cf97d85398
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it 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 unknown URLs suggests an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ceccarmaramures.ro/userfiles/file/48289543588.pdf In PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/1513533037.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/54811713664.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/89343160437.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/g3aonrh8b7q8i95nlnm36gv03q/xizajuxi.pdfIn PDF document text
    • https://asken.as/bilder/file/7519948258.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b1d1ed3517eb0995cd923c60e4da4544/gagulakavi.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d32adfd1---vonufapifatiru.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/17543186576.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/jogoroliwominogimaxidala.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a2362642cbd6917e3dd3c79af1f35415/20589419061.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/30a5fecaefa1ceb03e861c8e507fedea/foxisudelupugurox.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/gifewet.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/dimalufevepilofokekad.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/mesuxapovuremegopezuziru.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/duxadenokaj.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/tasegibowubijotar.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/fesotikofafelej.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/74706258926.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/xipiwuwiwitimawixa.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/25754472778.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/59353288575.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7062ba43a---55612480372.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/98426452193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=turn+off+background+data+androidPDF 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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 17888 bytes
SHA-256: 30a6cfe89596a3279216832e6b8cd22c3045307fb14c005e1c04bf4eae0ee51e
font_01_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 10600 bytes
SHA-256: 63e7d4ae7dd2cba085f65f1d64be4c02676954cdaa196477ff82747dafe34edd
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1