Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7b60aa66bbb2c5…

MALICIOUS

PDF

93.2 KB Created: 2021-07-01 19:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8de15cd544e088e1dd3b905697b1148f SHA-1: c9ae4d2b71a2d9bd2e409cb9dd8dd3e49b7bd787 SHA-256: 8d7b60aa66bbb2c507a9ec186a5908cdbaf7757219f1ba9049593eb001bc77b6
156 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. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to exploit vulnerabilities or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=air+force+pdg+questions PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608310c78fd05---jizanowerezagetu.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/sisozexoronitifibemeputi.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/6744182291.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/67756394065.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5b82ac927d6c419f7ca550b73c7495a6/bevunad.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/podipemepejup.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/e5f21464fea517dd2de0f598588b06e4/22740238639.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2e3abf41f---75459363402.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9bc4f0d56---16741358524.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/zesarilebeka.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160784fefceb33---41908973338.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/murekugugo.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072323c149e1---birezeseriwuvanoduvu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c7206d44---sutuxaxiviwu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2fcb081c---biverawuberapakosaja.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/rikazejobufibo.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/33412004915.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/47v8qd2on5dbb6ft3kci5jel7q/91822381988.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/96033964953.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609148c8f00c5---datonafim.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/doxusogafemepapinavis.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/vabigo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc002a1f61b---93738096468.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/35757826991.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 10812 bytes
SHA-256: 238ca4b089b02750753cfd76974ec50ed581239d92c9deb39a63d7aa33cc680a
font_01_sfnt_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off000121ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 17352 bytes
SHA-256: 793e2ce67275947a4972556830b8f0e9983e7b8909bf994b544d4fa1348cd1a2
font_03_sfnt_off00014f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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