Malicious PDF — malware analysis report

Static analysis result for SHA-256 991805666104b43a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 11:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7afc7d6fe24dc258c0b617ca294d56bd SHA-1: 1e8c51d6a794b5891318d2fed422b175bdf2f952 SHA-256: 991805666104b43acc5ffd4bfccc2441346251de89504a4952b41787a2ac14fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting it functions as a downloader or part of a link farm for phishing or malware distribution. The embedded JavaScript likely facilitates the execution of malicious code or the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://thaoduocvn.com/userfiles/image/file/xepebufemuduluxugani.pdf In PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606da40c0d731---34430108554.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/94194309013.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3852ef1e---86481211227.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/oa332b9l2nbbp2vhlsnvlp39fv/27547686461.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/visamijogemoja.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e2b2db07e57f385ed1a52499e1bc34be/kadegosofel.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9090gvg74n831h3q2camb77kee/9047904879.pdfIn PDF document text
    • http://centromp.it/userfiles/files/morokiliwewasikuzazigumum.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/fijokukerakoj.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nedugaturosebasajosutat.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/ad3a26a7e14a44ddc8415780b262036e/relofimanijozavokip.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/h2dqmb0c716jldm9dpnvgrimsq/xikamisivul.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/ridalepuwog.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aeae30512ad---dofitowewelabuji.pdfIn PDF document text
    • https://cape-electronics.com/media/file/viwuv.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3736aa22a---56884165303.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/xamuzomobanofebisutaxas.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/lizasapujegugewufabeb.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/6623827016.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/peserazumu.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/sebefoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wrecking+crew+nes+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 10628 bytes
SHA-256: 03ea58c44ac6301240cff80ebc9aaa8aac1174dadd6577be935b4ccd74712f31
font_02_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 17220 bytes
SHA-256: fe326158ffd698f7cb16d462fb8fef2df3ea59103d6da79c3d090fc6f45b5e71

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