Malicious PDF — malware analysis report

Static analysis result for SHA-256 137a65ced0f88d68…

MALICIOUS

PDF

84.9 KB Created: 2021-07-19 10:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec578cda625a8c1d77bc02dbcd985263 SHA-1: 5864dd800eae73def7743a10f8e99620d8ce5df2 SHA-256: 137a65ced0f88d68da82f583757bc0ceb47009bd3297a69d2edc3f25ea9cb0bc
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and a heuristic firing for a visual download button lure, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the overall structure and URL findings point to a common PDF-based malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • 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.
  • 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://servmed.net/userfiles/file/14228747982.pdf In PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/gibevik.pdfIn PDF document text
    • https://kimansion.com/uploads/file/31037250030.pdfIn PDF document text
    • http://guowangcable.com/d/files/53759869129.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf19727c0---35695558023.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/43756120991.pdfIn PDF document text
    • https://cape-electronics.com/media/file/gamupeniworevoz.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/xawikutoreliwurajos.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/25965146305.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc7158eed---53536181833.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608281ab0f2dc---kojimorexi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e703c59295d---71436074654.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8ad436ba49b3e365708da1a6da8120fe/guwowujuvijiju.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/dukosanudelajuwajogixigon.pdfIn PDF document text
    • https://silga.ca/userfiles/file/vuxisaburoxuf.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/49198307911.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/58209573200.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/57053395798.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb64cd07f4---31438427891.pdfIn PDF document text
    • http://kelvista.lt/images/files/zufakarotexif.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/mitupuxuv.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1052c10e4---fezugazubowimizewinogugin.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/radevavoxafalegu.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/4335677044.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/fawiwigamufata.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad914812cdc---34986118526.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6fb232fe7---dovokubegemazilowulanule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=opposing+attorney+misconductPDF 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_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 16792 bytes
SHA-256: 8e6cc721be6090f126a6906d397dc937116a72a651724a10add470d80a53ba28
font_01_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 11052 bytes
SHA-256: 936502974e9ad99d5dd4e92fcb0faf490ab9dbe82e2b099e57cc7389ac08cc2b
font_02_sfnt_off00012f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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