Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc4477083deb0a5…

MALICIOUS

PDF

90.9 KB Created: 2021-08-31 08:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 390e5094c1c60d79f541c954bb187b27 SHA-1: bdacd393cf0c14816f5aabb65c33029ef75d0fe9 SHA-256: 0bc4477083deb0a51caa2f0bdd7459e1ce3343bf34d857e8f50784c9e4469df5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggests it is designed to redirect users to malicious sites. The primary function appears to be acting as a lure, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.ville-dammarie.com/ckfinder/userfiles/files/kuxedavokukimofuro.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/13253696433.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b2eb8f123f16879c3abcc657b0b84bb8/66093967003.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6a84cfca0ad9ce1bb8ed006bd795a644/koretukobaj.pdf
    • http://18554080.com/userfiles/file/65137472199.pdf
    • https://jotekonybakterium.hu/userfiles/files/wijakolonaxi.pdf
    • https://poolpoint.be/uploads/file/76007613582.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/saripinezorixapifo.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e05b9fb66---47423796721.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sf09latr4nsivejd205n1r01gu/vibolekisononumipupe.pdf
    • http://stacjaregeneracja.pl/userfiles/file/64700581082.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8d8b9dd47---roxegexavuselaxe.pdf
    • http://kingsauto-bar.com/js/upload/files/82901876869.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/db9e2eaeb979cb0b9a0914cb5fb23a0e/22869860953.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/90972064146.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2e92d5fac9f01bc1e72ba9c77e3c26d7/xazem.pdf
    • http://buchtel1967.com/clients/26382/File/natupuj.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c041397d9ed---dajatafalibudukedatote.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/43e9d02025c63d6db588d8a79fb82c0a/napuramabulujufuvuzu.pdf
    • http://sarljarry.fr/userfiles/file/61886021947.pdf
    • http://ues-rb.ru/themes/ues-rb.ru/files/wiler.pdf
    • http://tmacfashion.com/ckfinder/userfiles/files/fixupuwufatufefakegimima.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607feba34ed08---2980101613.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+nations+shall+know+that+i+am+jehovah+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f226.bin
7ccfc9a7879d0b244041cef39d086666a00732e0b77417842bcce6c33b317e20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 11000 bytes
font_01_sfnt_off00010b89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 16792 bytes
font_02_sfnt_off0001239b.bin
6e1f716cf90029162086df423d0b74ea36d032ffae1723e07f39a72fb332f015
pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 22572 bytes