Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bf779550e32833…

MALICIOUS

PDF

89.6 KB Created: 2021-07-16 04:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca84f948bce51346629fab0f1467ea44 SHA-1: fc0f4eee22b3423e26bce4acf638ee78c8e7c00f SHA-256: b0bf779550e328336078cdc19209d6189b1fa5726a3a1f0f809e9e9b39ad1470
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of external URIs and the structure of the PDF point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb740bb3129---denuz.pdf In PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/nijimuzuviresirefixisul.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce6c5325d6---76227393960.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bf1440a44063e8f56b19e1fbef4679af/44174961827.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/p0pv03vfvfurh74dtqdh34kk2g/sofekopasusexamepabisu.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/mujikikowajigulal.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8cdb78d4cda712632bced3394fb8d7bf/39199855167.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2u4pkdsn8a8ekjvf61scepf5jo/fesezubasefovebupilodabu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e0865364d---60712731487.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e3aeba41---jegivofi.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/52425102024.pdfIn PDF document text
    • https://cape-electronics.com/media/file/52501631092.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/vopefuridudazuxijukaxezij.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/56429149556.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/3037648392.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vu3etvbk6lrjqg79ervr33pe22/zoxepub.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3509557689---27921559937.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3a57c0c3b5f9ca9c71490fb35f070ba5/19436479898.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a789cf2c02c---1309217469.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/73591u7p5haokcnaqvja74q7ag/80502649040.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/sutipofapimedifozuga.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/vazuduzawofulimuwusebopol.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/83597291975.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/6iohf9fboidjumio0bvfdhperj/loxos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=episiotomy+after+birthPDF 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_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 10712 bytes
SHA-256: a34d36853202dd18933deb9db498c6e73b508906935cee51f55ed13430c5fc4a
font_02_sfnt_off00012ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD7 17084 bytes
SHA-256: 7b8d8cd17d3b68e40a235ebc9434a608890c12c2aac47119e0f666d800b6c9e7

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