Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b97bd62fd14da9…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 13:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22f7a5091e1347be939140b1c11d0ca4 SHA-1: 88f549cdb3e1a1700dda337a08989392829fba4e SHA-256: a5b97bd62fd14da9ca731dffab27d9f6055d4aa08447c963390511139245cdd5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the document is part of a link farm hosted on compromised websites, likely designed to redirect users to malicious or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/699l2ko8vi9rng3bbhmoupaac1/27236757714.pdf In PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210921_12BAEFF04D361FF3.pdfIn PDF document text
    • https://titishop.co/upload/files/91320162386.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1f4d7d5cf1e44299eb4e09202352f168/73583435043.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/7409468811.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/81109928536.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/wonusetod.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/vazimub.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/nuxusabefowato.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/62401796898.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/14722060252.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/78701418356.pdfIn PDF document text
    • https://pindimana.in/uploads/file/26183628097.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/54815265724.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/46592555613.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3f06db29---69868068310.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/fotusesodududigik.pdfIn PDF document text
    • https://limsurempat.com/contents/files/xizimefiwefobonekavala.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/48124382686.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/gufupav.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/winetoripan.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/doxalexubofarisadaruvasej.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/mijapaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+walking+dead+season+1+android+all+episodes+unlockedPDF 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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10988 bytes
SHA-256: 8c0ad008722ad9d669e65c0a60fbacad8ed3c225e0dbf2815ef8349073de15be
font_02_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 19588 bytes
SHA-256: e54384f35bbbcd131e7aac42055167c51689508591a1d0012194d3273d7ffef0

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