Malicious PDF — malware analysis report

Static analysis result for SHA-256 057485ad7740b581…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 05:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a3d45952c66a6519f3304862e6e7500 SHA-1: f49d46147d020768786e9bdb2e8178239c363d29 SHA-256: 057485ad7740b58129bf63447205566d2e3efb17ae1b9292beb0d696de1f5e45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms strongly suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=fifa+football+mod PDF link annotation
    • https://megalight.lv/uploads/files/91984688653.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/kujodenujitaxubi.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/87214706202.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/22864196445.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a7fcbb4c---wovikiguxejaviselanawof.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/11682308629.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf31c3d6a---soxojosemulaker.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/zuwakijepiwoworalab.pdfIn PDF document text
    • http://machulski.com/public/file/34052102913.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/15086992710.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/pizubimojagivumu.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/badugupijafijulojefu.pdfIn PDF document text
    • http://dnepropress.net/files/file/52410525385.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/97372158322.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/65486237143.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/152306024432.pdfIn PDF document text
    • https://lecachet.fr/docs/files/17946841970.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/piveloteremalovagegamop.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/21905686755.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/mekutinilemijafufipibok.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/093b0bddf51f813f61f2e884f2bfd458/59963918247.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d6b5dffdb7acb8103deca2c4bbe0f06/71793928848.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_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 10128 bytes
SHA-256: 5a8975fed1ec6ef17ae535df05443a471ddd46fae8ac7623c98f47069ab780a8
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 18508 bytes
SHA-256: aa700e0516f46dc0ce535d7f80ae82473a75afdb7bfb0b83cd324d65b46fe04c