Malicious PDF — malware analysis report

Static analysis result for SHA-256 b945f3ce75b30ddf…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 13:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d89a7f7bff3dff4d5259df98dae22c6f SHA-1: c15039a8205d82fcb00d3eaa0cecf01f6bd60f69 SHA-256: b945f3ce75b30ddf10588dcb7489548568d2597fea9dc4256f6a4d34865edcbe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lead users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://archism.ru/uplcv?utm_term=foster%27s+home+for+imaginary+friends+season+4+episode+12 PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a3a1c9ea---16747500791.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/lk5hh97edopkrhcfquomkaaap5/5703059746.pdfIn PDF document text
    • http://aimic.com/userfiles/file/69867431268.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/70510267052.pdfIn PDF document text
    • https://moolans.com/uploads/files/mirowugekepinidugiwisiju.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/putinizusexeramon.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/5265388206.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/20vpgg3ad0ad5fq46iaklcc1tm/dorutuzogarodozofax.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3da68dd9---3510120064.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/mebari.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e09f1dd4c7a43e3b171339fb05075678/zikowalumonuluwu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6f6923a03942e819f4fa371a48d8656c/pedul.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/simoledusatofolimute.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/nosofuvinugatolip.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/ritigemipewusobozenusesa.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/62825039010.pdfIn PDF document text
    • http://ewtch.com/upload/files/gesikogakoloximop.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/nejuzitimurumigavid.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210826171203.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/94455451773.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6e0322fa---90325249935.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/lumonavifu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ed8d4ad05---guserowevibarawetux.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109011656391757.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/26201698183.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/47100586591.pdfIn 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://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_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 17300 bytes
SHA-256: 84557f0d9ac382e0e70f8c2a7f426797272176582d8bea885eb76a36894e333c
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 11276 bytes
SHA-256: 3a0eb28779112998525d84be15e99ab085bef35e159126209d69a1b94fd0f50e
font_02_sfnt_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1