Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ba3d2388c2bc6f…

MALICIOUS

PDF

91.5 KB Created: 2021-08-20 08:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8d19cbe46838ee1487500339158e4ce5 SHA-1: 716aa57680b3741de46dbc99fcccfd07c7b06c28 SHA-256: 53ba3d2388c2bc6f225825c205967e72e821756dab7bc467c66261978318be0a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f660c1db4---2434065805.pdf In PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/68a174d853242ca92abed64426d1e591/wuzunudefofuripudoxij.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ea6d384fabafcabfaa315f2a219d3b36/57323299056.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/79093390634.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/kawebavilafuk.pdfIn PDF document text
    • http://parentini.it/userfiles/files/rixigoxapirifotovonago.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3784b0df---luroju.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba2ed96c356c87fb2f9e63e232b78f0a/xixorev.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/75abf7b76f4b90807a8d39629a9406ab/gewezejarofifutoganaba.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/zivebogeritolojuruduki.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16dfcc5ea---77712257156.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/mubajejogiraratotiwusig.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/57441168541.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/zijajifugeganufusoraxovo.pdfIn PDF document text
    • http://cga82.com/admin/File/nusifoz.pdfIn PDF document text
    • http://abpaluso.com/upload/file/33880843982.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/97320b33c66781863886dea628fbe494/devoluduluxeredivamo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/nmm46nna68fe312m3dcr5llq8l/1996821897.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/87462504499.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093430c0cb6e---potikul.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202108161020351434.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fc4f94f2c---zewikokewubufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+meaning+of+ayatul+kursi+in+englishPDF 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_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 16800 bytes
SHA-256: 1fabbc35a45fca42836704a8033e858179aca565f562e9c49d51ee785dec9bae
font_01_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DA 10960 bytes
SHA-256: 8f3f25c9bcc589d12303ad17c260939a02dbf5f12f6be9f1c50a85be07427e32

Open this report in the interactive analyzer, or submit your own file for analysis.