Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdbe702b5a5c9e0…

MALICIOUS

PDF

90.6 KB Created: 2021-08-31 22:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 911f033ce6683c04a7f5391b46429b4a SHA-1: a738155a0ba4da1e89d77eec2143ac8c764fc409 SHA-256: 8bdbe702b5a5c9e0f131b1cb10444830d17453348938209c9e38cc8bfd3528ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://humanitool.ru/userfiles/file/kovumejumuse.pdf In PDF document text
    • https://fallahi-sch.com/userfiles/file/78614767883.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96311352e9---20584515147.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/93087771953.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec5acdc568---lawogepelapuwifuku.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/24836571795.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/pewider.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/62764794668.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d8af4880749c1c9089bed4e067e2a3f6/rimajode.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/1555140027.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c538f9a30ead75ec2a91c67318a3b666/tomipaxakag.pdfIn PDF document text
    • http://progetec.org/userfiles/files/56466411499.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gli0eggngmnb1vkt4kbe16l3nd/titozalojaluno.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3cb43ac44866db5fb910d27f308dad15/salepobupigivorowedunaba.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/pogefigezo.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c123cd46743---41683403778.pdfIn PDF document text
    • http://computerdoki.hu/user/file/vajifuvefewin.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/12462147207.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/jomifik.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/kexupijudigojitudafogamo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ee9909fd6---xepipefalelopenudu.pdfIn PDF document text
    • http://strap.sk/uploads/files/lijoxevomavusalij.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/tefomikodepivamonoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=los+angeles+to+sequoiaPDF 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_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 10388 bytes
SHA-256: 81f7fb54511befe1894519a04662cb64765868b2051339f17d23093e76bc13e4
font_02_sfnt_off00012da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 18164 bytes
SHA-256: 81aa476897139eea91b0db2df7d45903047bece8ebea1871e41222d6a9b8ab58