Malicious PDF — malware analysis report

Static analysis result for SHA-256 397cc0f002f8097d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 19:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23de0846f3c8e974c7d831485a6939b0 SHA-1: fc710b07de89192d2a537942584e62ccaac1ecc5 SHA-256: 397cc0f002f8097d067ddd72d01faa6b4fb6a1556b93f5b4201847d3f6933026
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security filters by encrypting the actual payload. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=best+android+3d+wallpaper PDF link annotation
    • https://energooptima.hu/upload/File/bosufupaj.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/dijowoguvev.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/93051311118.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/66681188626.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/22466350863.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/53295229946.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0601184121eb309c7f4c4800ad3a5b64/91179961474.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/63413733357.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/xukarokopuzozanir.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/53090240066.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/76372007573.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/wisolavozozadigakuvotas.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/34359739584.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/23198429873.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/97434407257.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/56424298189.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/vunej.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/miguzilogobejuragejilew.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/zusotawubazinuveponazibex.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210917185119.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/26905139151.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/c16ovdi0buekd0kvbin47grco7/gugoputevatiwab.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c7193b01---nafevujagofilaneber.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_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 10696 bytes
SHA-256: 827469cf94e6162527321f0e5ae213c60f02837d834fcd49cf928ff7be4265df
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 17640 bytes
SHA-256: f123f1c37c5e1c526663d38b4f350ac76492441247c70cdb7974407b9fb26106

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