Malicious PDF — malware analysis report

Static analysis result for SHA-256 4862439a0b1c9d7d…

MALICIOUS

PDF

83.7 KB Created: 2021-07-16 16:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6925b2745e08c363a8e782357d1dae69 SHA-1: da2779fd07ee6cdad55d128104f10f7528c2597d SHA-256: 4862439a0b1c9d7d17ccc636c63288c71af54cb02bb068d03ad104acaa5405cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • 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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/r8torh6sndb293kofsbvs2omm0/xosogivemilopuxukirulebuz.pdf In PDF document text
    • http://asesorgubernamental.com/images/file/90362422868.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/dezopaxasasiverevane.pdfIn PDF document text
    • https://beliangka.com/contents//files/93412034571.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160746a7072d55---bubupodosorekilagofuz.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/16686551831.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/xufesakubanenejaneti.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9b5cc388a---sazitetaximemovezizorav.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c016ae75820---dilenunuwug.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1b2c017e7de8894019777be9d2ddeb7a/51216069459.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16092bdbda9635---rasugezolubewem.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zasadifizedivaguzufeve.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/cjk4lv8jhg5g641tq6cnrfpi1i/werumevakubebexapawiname.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/69370562648.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdacb3fe62---64893454888.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2386b01102---peseloxadifazijunomawazog.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/wabikowitanaporadezeko.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/19ec6qpt9i0t7hs73vvfbeun86/33910414604.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/po831anf6hq4r24ojbspfievc1/razal.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10be01ec3---26949742283.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ec41a67b37743d13724d1638f4db7fc2/pizutatofanopuzevek.pdfIn PDF document text
    • http://rafaelokazakov.com/file/12305286012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=one+punch+man+road+to+hero+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 10596 bytes
SHA-256: 9d4f08855747f385f9fdd4501db91408932489da67f43d56846c7adcc4d8a295
font_01_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 18752 bytes
SHA-256: c1df00c3ca2509c3a77ae41d437ecfca622f0e35f8c7a45b1c5598102b3d12a0
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 1840 bytes
SHA-256: 2b7939c57138d92767e8268ab7650998e2fd4fff7ceb7ea9c59c6f24cb111b08
font_03_sfnt_off00012934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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