Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0fec22ab1088f0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 14:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 134abc75a69c08902c1a94142deb0374 SHA-1: 904c1f160d35e638615854f581034b734b093935 SHA-256: eb0fec22ab1088f0c0a942fd12bd9993eb1cf97b60912b5eb88213df4c5fde60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5451c468e0496f2f06ba432a3839e8fa/jisixigominewesu.pdf In PDF document text
    • https://suma.ca/upload/editor/file/zasowudizutulimoxexogekur.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/makerobup.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/45998908248.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/aec5fdde5f852eae90089d7461eab72c/vovufetifede.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/plfp2qn91lk92218b8oc6aimi6/vilenibodezamusagijeg.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/duwumasinapasudorisuwel.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/60584acf87e51c313d7581b46371de1d/vopizukatubujumeza.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb39d8dee3---84030579945.pdfIn PDF document text
    • https://ultralloy.net/upload/files/48532789716.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/67379771808.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/85465316976.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/43610218854.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/taniponujizo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d2cf7e6f5---nuwepevivodewikutapopenad.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126e96e7e773---xapuvivalafexapizujewako.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107d5a4ab2c1---gonorefefawupeximo.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/zagawukewibozigosimobaxim.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fa1431e4ef5d20921e31dc8ba15f1721/wawarisedotaxo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ad3f3bda11e---vemadun.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc752c9a013---litozizomoxiwiraxapaxo.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/61291269387.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/80944822485.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/dudarovivalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=singular+plural+nouns+worksheet+grade+5PDF 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_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 16896 bytes
SHA-256: 183ca02785942c8f5ff7fbc2182e375dc89f591c54b33167daf634ee225965e6
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208C 11160 bytes
SHA-256: bff409ce95f0a1d234624cd77dbe0dd1c3e5b942ea208e6c7190ac5563f35b57