Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50f3885ee6f4172…

MALICIOUS

PDF

117.9 KB Created: 2021-09-03 03:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe9cb25d7fa9e1eef7a6c0963c78321a SHA-1: 846a8b2bebc6b020c5b1b41395974d0dec10d353 SHA-256: f50f3885ee6f4172f0d9e6ca67fe301ab81c6fc1d3f49be36d940b38de48bbb1
256 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing and social engineering attack. It employs lures to trick users into installing browser extensions or viewers, and also attempts to solicit sensitive recovery secrets or private keys. The document contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable, suggesting a link farm for distributing malicious content. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly indicate a phishing and credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/og98iue1a3q9bikrhipe93fq66/vekovetinepifofefesusipuw.pdf In PDF document text
    • http://stonebriarranch.com/clients/876969/File/nifodosa.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/zelebasegafifevesomo.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/kizapivi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/gov27u9g60i4b6d7us3lb74gg2/30895975850.pdfIn PDF document text
    • http://cichanski.com/Upload/file/4054255350.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021619259407631.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5c030697cfc921f73154b333ef498a6f/wovizoxokokilusaj.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed12183294---sojuluzoganevisikuvexe.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/73002399554.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/88864754503.pdfIn PDF document text
    • http://teplospectr.ru/images/files/68687898959.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160900cd570575---puvefazemarim.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834199b4b4b---zupapojufufadoragimofan.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/filit.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ma8fsesttfq6ir563evie9p9p3/zijakuriz.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9ea09f9e7---65775901015.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9308c83d9e994e7b54b4fcdf639b4310/57270962956.pdfIn PDF document text
    • http://cwesp.biz/upload/file/zozexagapuvajovo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d1f124d29---79603367229.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609be65114a80---89149846810.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcfcd1adc8---26942542165.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d531ec16aa2---mamesonukovef.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/80679180997.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6adb78546---76657775039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=combine+to+a+single+pdfPDF 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_off00016818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16818 10912 bytes
SHA-256: ea77efe956c8d3c46c9a606839351e4da6393529f55bdedc027b2f345d17721c
font_01_sfnt_off000180eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180EB 18708 bytes
SHA-256: ded5d67411f7885b83e6ed909a49dbd89cd67c6afc7aba7e262c2410b53797b5
font_02_sfnt_off0001b192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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