Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65bb85703d79f2a…

MALICIOUS

PDF

122.2 KB Created: 2021-06-24 23:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a772978dbc0e15f6483e9c7c72400d6a SHA-1: 811d18c6c23717c8b85096ff98bf5ba9c81b1429 SHA-256: b65bb85703d79f2a7d8531555299a7af69dea4fa167934f43ff48e6e4b5191f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to download further malicious content disguised as book downloads. The presence of numerous URLs pointing to compromised WordPress upload directories and disposable hosting suggests a coordinated effort to distribute malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=masud+rana+books+download PDF link annotation
    • http://jucal.es/images/file/92353496963.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453092c0a3---pevepevirixozuba.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a8ce794e---taluletimotexesu.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/xuwope.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e1aa45250---47050873329.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nedugaturosebasajosutat.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/fovuseriroguxerekejuwex.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/faditijolejamakalunawi.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1617e994---55360802721.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210530031034.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a5f529bb2f91265498485a3ac316a19d/40554419412.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/vulisoj.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/rimulizineridezuxamekugut.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/jugukupulujejesotev.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a3ea5554c6f5b6d985ffc0f943c3f6b1/21620727910.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c44960cbe63---dikiveto.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/2981716039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15771 5120 bytes
SHA-256: 86a772f54004c47e31a7fe3e08de83139b5aa1ce7e8dfbf31e5b88bedee2ba00
font_01_sfnt_off00016901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16901 30212 bytes
SHA-256: df616cb89a69afec56a7df5c7019ed11dcd64d79a4150c821ffb2fd4a26f038f
font_02_sfnt_off0001b6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6DA 10708 bytes
SHA-256: 38acac26dfb185a78427ad94e803b0a9f3e4bc7229ecedee5fab520053ec3cb9