Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea318f997da3026b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 19:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83c1186400b4c594c63c3b2046f8921d SHA-1: b0208970da2a700e6ad7350046a2484612077564 SHA-256: ea318f997da3026bc46ddd4ea932c6f46140e9cbba1eee909834f8d2c4b91d54
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://chcial.ru/uplcv?utm_term=pes+21+android+offline PDF link annotation
    • http://k1a.ru/images/files/file/fumusejafufatod.pdfIn PDF document text
    • https://12shio4.com/contents/files/bemev.pdfIn PDF document text
    • https://ayurmitra.com/files/file/68264993658.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/getawufo.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/75549995458.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/xolutuxure.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/61507300921.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/41645858138.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/76551384373.pdfIn PDF document text
    • http://guitarenko.fr/img/files/wutovazoteduwiner.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/7653613963.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/xokuparafafajifisiboz.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/40420026640.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/52e1510877a59fe174547cc79bb4481f/99774521447.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/tikadewuvak.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/dixutubeforerikagetebot.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/33094928295.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ddb0c3434---36903267463.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132cae17aae0---31234425850.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///wepebabepowuvejeweva.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/98511384187.pdfIn PDF document text
    • http://ned.ru/uploads/files/46578642517.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/dapipamisisodipesat.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/95792726303.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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 18444 bytes
SHA-256: 15b5a9f6be58c2fdc31f3ffd2f1b3d9d25f6197120f7c7442979174d718a39db
font_02_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 10420 bytes
SHA-256: 0344e80141fd16634aadfb256075f8ddee0d967c5ce2c95a48b2724413e60f0b

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