Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b02a8a1888c49c1…

MALICIOUS

PDF

84.3 KB Created: 2021-08-04 00:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 159b1ecf4bc832cb2abb6b31c8dd4f6a SHA-1: 2b3e05744b231142a58673efa4e20a0774b2667d SHA-256: 1b02a8a1888c49c1a3e6d962d87721b72d7493cfdf80de55cea5191b2aeb4e79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed for SEO poisoning or phishing. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=how+to+star+delta+connection PDF link annotation
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/20131ebd72f73b7b298f89c4ba15fff3/76956347768.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-21/20210721010337407820.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/joxugaloxodomipeba.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6dc5ab9808c2c2e1f2baf0d9c3499999/35886740272.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/30548319049.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/9540036746.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/427ccbf809522fa30dd832718834c5ee/42269266191.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/mukuf.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/d3pfsntbcecld9fropjbh53s24/46120410312.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/50545063263.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ebafb9c150f12f9cc6e700d266a436ff/jokozowa.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/lezuga.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9fb54240f889dee8fac10f38d746348c/23043654839.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/11414724643.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210623233147169.pdfIn PDF document text
    • https://andrejc.si/files/file/dozomi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/26356760255.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/buxuwubeleloki.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-1/20210701221714573642.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/6517577605.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/nijapulef.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086e35e61626---zexibod.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091bab29d9be---puwosezafeximojavanokos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 10440 bytes
SHA-256: c9cfa0deded0b3cb1abb4d6bb0b6082d45593198cc0480de1b9a85ff72f7dc4f
font_02_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 17060 bytes
SHA-256: db0b53320712ca3ded2f75016be7c2d9969718c58c5a37f4abc60a047131d708

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