Malicious PDF — malware analysis report

Static analysis result for SHA-256 a205b993a8b6ea30…

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 11:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ea31b07fef85a3f772daf36d80bc92f SHA-1: 3a7d764d9b19d6bd6cc66cddc1ffe91db8ea5a37 SHA-256: a205b993a8b6ea3068d70d6c2f711d9416eb1fa0cd33f3021f150dbef9e6766c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous links, including one pointing to a compromised WordPress upload directory, suggests an attempt to distribute further malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=how+to+write+a+concluding+paragraph+for+an+essay PDF link annotation
    • http://chiangmai-clean.com/user_img/files/koziwow.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/renulawepepisot.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/51010724648.pdfIn PDF document text
    • http://henca.com/files/details/file/fukutog.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109101247576584.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210913021648.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210908_10173E5686A81106.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/sodojosubumilimarazasiwe.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/wolirubomonemevomum.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/1c86133b45359cf2c516da449f9cbe3e/fazaxi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f71556024d2c5fd5384aa6cefd68fd25/79493690140.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d7924bf48b4a5e59702f9b9ced6b8f20/15148687165.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/62409107470.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/27184212211.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/43004540914.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/73165274404.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/notsn999hnphce0c8f79vhajpt/28375062547.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/2664643798.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/46364142115.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/87094966786.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/29781176289.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/pixasefegenipo.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_off0000c1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 16872 bytes
SHA-256: 789ebb9dbcb3b980de890a12c5b678020a9b5583f237d73d3d1e65de2f8ce01d
font_01_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 11188 bytes
SHA-256: d2fa8681a55ed7bc3f73497a0fc6aab0caea085793d1d52d3b58255d6b7a9385
font_02_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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