Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4df2b190690f3be…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 00:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12b02aafd0a1bea2062d0034e76b87ef SHA-1: 2efe285ef6c4a0100ef125d40c68c426c2f80d0e SHA-256: d4df2b190690f3bef75b61eb31d3508772ef9566ad5378a81532497005f9b534
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, including links to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nomylo.ru/uplcv?utm_term=mega+man+x+dive+apk PDF link annotation
    • http://ues-rb.ru/themes/ues-rb.ru/files/puturarun.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/wigosob.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73852002811.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gugakor.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1541566886613ce65d6b322.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/94366842787.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/mimelimive.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/pumewedukalobifu.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/pazoxatoguluk.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210911_150410.pdfIn PDF document text
    • http://rubensova16.cz/files/file/14415170028.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/jososipinojeduma.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/48084844678.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/sorus.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/dosoki.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/11796259721.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/kaxuw.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0bbae9b6---94609611824.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/43334295256.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/95106402006.pdfIn PDF document text
    • http://ukrfirework.com/images/file/dumopomi.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/dofosituzafopofi.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/75752030354.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131669293acb---xoxaguluzukivinoxu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161404ea924410---detiwusatolefuzovubevotir.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_off0000be7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 16728 bytes
SHA-256: bf4e875f9e7a43a73f66a61b8ec69e9f6628ff5343b6e0588181233e3d5f31b0
font_02_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 10456 bytes
SHA-256: f1de8ccac3b9f4bfd0fc12ea0067b6f9acfb61bc31e1754af75a22edf9af6d21

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