Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a8c3094e40e7c7…

MALICIOUS

PDF

87.9 KB Created: 2021-07-19 22:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: df52eca173300a25cb4db64016a9a7d5 SHA-1: 9c94e59ee332c33c2bcdd1f1d03345ad29e51826 SHA-256: 86a8c3094e40e7c78f6c07a0a1337ec2598ed0e6c71f70f4251612acbff6feda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the links and the detection indicate the PDF is likely used as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zdrowejaja.com/Upload/file/89757734771.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l6b9l0ijcc4djt70aqp5j1r6g3/61921110831.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/85014231257.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609457afdce4f---78668573152.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9877f5b207---gefazosexowifivo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/07a98d2fc2b24ecccf3e7091f3d05c90/26599091609.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/xabitifuramitoxi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/tpjihlu9esqkrm29q4e63l4vds/13435152758.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607521dec65e1---butikola.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b65f8af47---19684211.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/mogerudivepa.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7149a0ece5---77977927874.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/997793877.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/96383445825.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/66q5gr9mrs8pb12nvbper72ak6/9379842118.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/zoxilomabizemodonosu.pdfIn PDF document text
    • http://fxmeat.com/upload/file/050fbd0cffc46386bfea549c88ab60c3.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/61369917711.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795ffe14afb---goxub.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/gemanivut.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/bezufegolezomivoxapugaz.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/rowiveletabulojuwogub.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/sujamuzejumorelojageje.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/87cedcd7ce439f14e43bcd3096f18adb/sodimaviximu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=methodical+approach+to+workPDF 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_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 16640 bytes
SHA-256: 9648b7685466e37d48fb64a08ae63faa330f2a748260430be089675755b81987
font_02_sfnt_off00013a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A53 10512 bytes
SHA-256: 72c33c7b6c7c07447e2b5634bc881b1a00419dfed96b74efb4afc3b36f746e9c