Malicious PDF — malware analysis report

Static analysis result for SHA-256 723c2900e4f8db1c…

MALICIOUS

PDF

104.4 KB Created: 2021-07-02 10:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd86af3b9a88fa9a3b35106a9b241f30 SHA-1: 45796f94d05d0cfc8ba5e33225285475141c7b50 SHA-256: 723c2900e4f8db1c822eb40cc0edd06c96094f3838ad926d6d9952cb901365a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=meaning+for+obstinate
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4a2nu846mpo73qgmbd3ap1kkk6/sixeviva.pdf
    • http://altelaw.com/uploads/image/file/dododebukukogatog.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tiwijadobekop.pdf
    • https://apsco.ly/userfiles/files/21448227135.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c7688608212dd7a9b2ea7cfa5f7834bc/85732182038.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/467de633214cabd1249d496d8ef6d600/63239915238.pdf
    • https://burgas-remonti.com/userfiles/file/vejifupaz.pdf
    • http://bualuang101.com/backoffice/upload/files/61095173122.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1975e8d97257465540486bdfc1a75d52/tojisikazasefexuvoguluj.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/9b684e5f0381c061e0bf7f185354fe99/ruxovonavuguzuk.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092ca0a24bfa---vominigitukimizezefa.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/fl5ma9rjallmkvlfg2tq3tmel1/zubarikepebidudexumakawud.pdf
    • https://equantumconsulting.com/files/files/xezekimumo.pdf
    • https://clubesolbra.com/uploads/files/togumepapeju.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba5e74ba6---zedogutajusikamu.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0438dc6c74---taxixifoxifisusatisuvirib.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/11fae8035aa7603c6a729fbb6581fcef/59453352103.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a05463a5d---56408694360.pdf
    • http://hiace-yoshikawa.com/js/upload/files/32790161275.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6acb0163---69620431947.pdf
    • https://baoholaodong24.com/userfiles/file/paxifufowijurojo.pdf
    • http://yogo110.com/userfiles/file/lakiwulubewuxalukobifaw.pdf
    • https://ludifrance.fr/userfiles/file/71322277647.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/66087558208.pdf
    • http://royalgoodviewresort.com/Uploads/file/24466670001.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000149d1.bin
7a332fad594ab0e981960a2c684844ae80887e8909582ea30dc49c039cb119e0
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x149D1 19604 bytes
font_00_sfnt_off0000f0c9.bin
a2d5ba1a7422d39558220b4488d634e26a444e5a3bf72a0982820ef443880eff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 26952 bytes
font_01_sfnt_off000131e2.bin
c42606247dc8a5a2c235365f1e42ea34b0fdca5aa8bc3ca45836972ec42bce8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 10476 bytes
font_03_sfnt_off00016b57.bin
57be1178001849cdb593210c7eb9a33331d7632d8109d0c16fe90d64d3cc2a5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B57 3812 bytes
font_04_sfnt_off000179c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x179C2 16792 bytes