Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac43cf9c620134aa…

MALICIOUS

PDF

77.8 KB Created: 2021-06-29 22:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a20051bf7d64a0b0bb6683ce47d797dc SHA-1: 69acf1f0915fc680d79ea185ef584603d00a4dd9 SHA-256: ac43cf9c620134aac013a92391f8983d440ad042daedfe22075e130f8cffd974
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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 http://upoart.com/ckfinder/userfiles/files/munonubasubagux.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2a216044---danaxegizawaje.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2de2ca2d2a38a52e1c6e3e0319300b99/135290121.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c38aaf916a6---dawitijesetig.pdf
    • https://standardpromotion.com/images/upload/userfiles/files/lukupagopavamifi.pdf
    • http://www.bufolari.com/public/immagini/file/talopigelubiraxowal.pdf
    • http://growlink.biz/userfiles/file/40192661245.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d3d87aec3---17667594385.pdf
    • http://lycee-elm.org/userfiles/file/99974343636.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b015e7a0a1---norolisaduzekukuf.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/82109748588.pdf
    • http://zgkimsteszew.pl/img/upload/files/86146264383.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5693c7993b887b6dcce18609fe493053/fagerutejukiraxapagofetu.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/xapelewefiwonituwuguni.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/77bac95f8055ffc759852e576df32aae/vilanasugafaguregixute.pdf
    • http://happyhanool.com/ckupload/files/34255055413.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/h6fl65v9pfutladqigq5groqp2/79405176322.pdf
    • https://angelsstaff.com/uploads/file/13610156478.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/58976733392.pdf
    • http://provia-events.de/pics/fotos/1/file/benatotajekesisib.pdf
    • https://arichaindia.com/userfiles/file/71553773793.pdf
    • http://faxik.ru/ckfinder/userfiles/files/886439007.pdf
    • http://www.asslar.de/downloads/62737188325.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607348620c86c---51463698975.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+add+a+pdf+picture+to+a+word+document
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce5e.bin
5e5cb3a3742868f9d4988f05055b13b071583cb32d52240d07e3068b3cd3a520
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 16276 bytes
font_01_sfnt_off0000f8a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 16792 bytes
font_02_sfnt_off000110c0.bin
51a9820a018d71d2c4ab3ebfa03a4dd302a7db8414455edca544d57d145c36e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 10744 bytes