Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e3b2a0fb9aadd5…

MALICIOUS

PDF

93.3 KB Created: 2021-09-03 23:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55d43fae582801fb645b9d12c5381388 SHA-1: 37a87b4aa88922a46c0d7768a0e468ff83693795 SHA-256: 43e3b2a0fb9aadd5ba7318660f0e7e073ea20a168cd0830d9ebbe7c61cb50c7b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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=english+grammar+voice+change+pdf PDF link annotation
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/f444a0843f12c6c1aab1d1e90774a9d3/vikubawexuvoxodar.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918a6a2acc7---tekoridigifokugiposonav.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/zixawiwuguwoku.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/33524091601.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bebc8f35---tixuzexawonosatewepegirel.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/jalipebaburezotuza.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/61553b4ea58ee52027f0bdaaa2809324/dewezosamefabi.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/xekoju.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/99088274942.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a75d9c87a91ed26d38bac17acc91bd15/97853928172.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/tewatadetiziwuwe.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/79b8d567cbb5695849e05e6a4f598bd6/89921934312.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/905e2feb14e26a615edd71b7de8f5521/sapatonapikotaniku.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/komedonutewukinigimonero.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/wanimusexazulalojasema.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/limawuduv.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a5d8b529157fe79139e6ca12cea25fe1/5460011231.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/7ac16c73057d7cefd8e8797929fa55ae/fodof.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/3685464546.pdfIn PDF document text
    • http://innotack.com/userfiles/files/47299990953.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/96b3b42b880d1e50a36bca6a20e2b553/33153476468.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc427978af---pazumezabesenijodoso.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/wawemisavegebeva.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/paparerefesen.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/98049486289.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16214807010389.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/78373598874.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_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 22000 bytes
SHA-256: 16cdf40888079b0630c7a7309e9ec4b44b622b7a2e7cad95db449bf26553ff21
font_01_sfnt_off000135e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E8 11016 bytes
SHA-256: f995be33cbbfcba2852879560b6c487f9d1495c202f50545d799ac619710c8ed
font_02_sfnt_off00014f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.