Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd2cc6498dc5741…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 22:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 521b34e3082284fa9cbe52c4a4de60e1 SHA-1: 1ff136166ee9e97d1c0bf6b36616a3aee498c207 SHA-256: 5cd2cc6498dc57413bdbbd8f7b85f25c2ff098252cb77c01c1b15d7d3c247289
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, some pointing to compromised WordPress upload storage and disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt by luring users with terms like 'beyblade burst app game download'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://choinka4x4.org/cms/files/file/futiteke.pdf In PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/46514535791.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/pomalafafufirigizef.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/rizujes.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413541abaac---koduzuvizipibu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2907d7fd7---japobusedapebipasagezonuv.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/4324508685.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/gonowaz.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/mafobetuforakusesiti.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/pogegalotigigi.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/81596636324.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1810e964---24874105293.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/padutezaxezubub.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/welirutasevesuravunofake.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109130643226781.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/79141477812.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/fezin.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/25243219540.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/tupafugutel.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/23788109433.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/70599580298.pdfIn PDF document text
    • http://seamacros.com/upload/file/27780138150.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/rerufilijudiret.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/kejimemavipegufefezik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=beyblade+burst+app+game+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 11136 bytes
SHA-256: 19a4752f92b7432955275d80ae80af785fb92d7198ed7baf0649c73064c02cf4
font_02_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 17612 bytes
SHA-256: 580d87de4762b4dcf499297fd0a609ddf2588ae04cc75e0af518978f4b8693d5