Malicious PDF — malware analysis report

Static analysis result for SHA-256 897796e73eac1a1c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 17:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b15fc791dd82c5579cd545bd64404874 SHA-1: bd95a08e75494a511093a3448643ccea1e630e5c SHA-256: 897796e73eac1a1ce36d105c57c2b90de273234794aab3c9c01074c30307a786
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or attempts to trick the user. The presence of a link farm pointing to numerous unknown PDF files on various domains suggests a phishing or redirection attempt. The document body is heavily obfuscated and contains no readable content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://e-motorcycle.tw/upload/emotorcycle/files/40874221308.pdf In PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/tavizifibatelijewuzaziwo.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/fatibopilazamolelapoko.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/31230985866.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/79364745004.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2s771qkii3s957mc079dh0ato4/88850456089.pdfIn PDF document text
    • http://freeski.hu/freeski/file/40871748248.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/22401197888.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/37253041287.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/lemupan.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/36151151571.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/709642120.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/12068304081.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/6105683973.pdfIn PDF document text
    • http://praguetransfer.com/files/file/85509404817.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/22544555571.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nirotuwiwidanaxodebi.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210924115553.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/71545771966.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/zekixudefafusulurejaj.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/42937437132.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/gepofukotivijo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141936919217---81534898156.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/rawodaxur.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2e1f966f8b145bd85b001630b5806494/4262646881.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/56635844589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hack+mortal+kombat+mobilePDF 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_off0000b59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59A 10344 bytes
SHA-256: cf463d8fe7b9b4a241a5497ef35eb9b2b57bc59a100c6a934e45c04ae445fdaa
font_01_sfnt_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 16012 bytes
SHA-256: 16f5d7bd3e4ccbe3967cec4d86354c1fdc6df06a57634b78644a8908c7936562