Malicious PDF — malware analysis report

Static analysis result for SHA-256 38af20ea0c06268f…

MALICIOUS

PDF

88.3 KB Created: 2021-08-06 22:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a4cef1d87eee0162ca101aa30e4409bb SHA-1: 808b84cccde6503f0e1a0fea415e5894e4b2d4dd SHA-256: 38af20ea0c06268fd1ff2bfb19ed814a9649f4a12d8659971445ed951aca94c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript which is likely responsible for redirecting users to external URLs, as suggested by the PDF_JAVASCRIPT heuristic and the numerous extracted URLs. These URLs are hosted on compromised CMS platforms and disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=how+to+turn+off+a+hot+tub+heater PDF link annotation
    • https://bandotrading.it/uploads/file/83295523219.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/bifanabasej.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079557c1df5b---famubelodeteserekolavoxa.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1625667105.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/gixerotipajukidovuze.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/bhpsc6m55n6kih4d2garb26ran/kuzinuko.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ufcav61d8rggebqj2cbn1ekpmg/fapedoxade.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/bukuxabisona.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ab02d0f42d0ae9b79277b1bb4fcc1fec/96320600485.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/nejukabow.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a818ac1e1ab---tabezebupudorabeno.pdfIn PDF document text
    • https://loctra.net/userfiles/file/joduxozezepikadokini.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/jekosekijarab.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/68623010481.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc7ade304---rabonivedelu.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/1005652659.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082723530b3c---xemezuwizepivamu.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/pixuwikelizupipixanexubo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160759064ae6bc---vuneredapoxiv.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/xoduvitubugometimo.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/banujemafa.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/tuxodoxoxototowipotetux.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jimulikix.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 10324 bytes
SHA-256: 9816503cdbc640284b24a3fe28f9b3e873b623015fb03d1dc7986d8adc8d2ff7
font_02_sfnt_off000123b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 17936 bytes
SHA-256: 76abdaa8f94c908163e2f3e56f8a4d2617f06f3e33dfb5534fa80740db3b5e05

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