Malicious PDF — malware analysis report

Static analysis result for SHA-256 692de10e9c373c4a…

MALICIOUS

PDF

87.4 KB Created: 2021-08-09 16:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be023d9ff8f1bac941aaa11bd37f1a5e SHA-1: 0ddd2884002195b9bfb08a58b43cd55efbc2b18e SHA-256: 692de10e9c373c4ae085cf85f63fde5a4e9fc8e86d94a10c7d51a9b759e954a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to various domains, some of which appear to be compromised or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to download content. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://maychaybocaocap.com/app/webroot/uploads/files/funatatalolorija.pdf In PDF document text
    • https://fl-forever.com/upfiles/editor/files/20402174460.pdfIn PDF document text
    • https://guijek.com/userfiles/file/4993016952.pdfIn PDF document text
    • https://datawire.gr/files/files/62700427890.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/rulatagefefaluvozulisoxew.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/ralanugak.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/zofetipipa.pdfIn PDF document text
    • https://norservis.com/files/files/99255413518.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/31473256349.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/51489768044.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1ecb318db---59809936604.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/38555764040.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/3642047112.pdfIn PDF document text
    • https://fobh.net/userfiles/files/41277389953.pdfIn PDF document text
    • http://slsnn.ru/content/files/wefukerabi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/02bc95e2e96d20dd54779a05a6946017/fofamabina.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9ecc26e8f---tojuperinefasesix.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a921c35db16---xegudosozifomumipelu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20bf69b4f---vapuje.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/53908386044.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/dovokagekabi.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/qa47ip55kek0gfrg3ii91rl884/lipomibatilonexukigipax.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95555755764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=carrom+disc+pool+mod+apk+unlimited+coins+and+gems+download+2019PDF 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_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 11628 bytes
SHA-256: 8d383847c430f1ccf8126dc47eba5b0eda809664d46e763bee58cd17412e4389
font_02_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 17080 bytes
SHA-256: e01e6f1e49f0bcf6f9da67016ff9a4c208243513adb59455671f7a81b814f0b7

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