Malicious PDF — malware analysis report

Static analysis result for SHA-256 836d3fc64d4196b8…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 10:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cd1befde386851947e55de0fc41f3116 SHA-1: 2e1dca3532280786ce6bc26428ecd8fe59a84662 SHA-256: 836d3fc64d4196b819166047627d19d1e9266c4053a44bc37f1c17d15d143351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7309

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://heyratacademy.ir/file/11974817111.pdf In PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb7b8091e9---26016087344.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/36372352372.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d90f6dabdd101c3cec58c9846a00366e/namiraraku.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/zamozisidepoji.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f8d9339a51a30ff3176806a9b1f7bb29/29004318411.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/komal.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/tigorupenimag.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/23591983191.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/gemidibumunosub.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/tuvipedejixetode.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/buxolifetaso.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/63035141656.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d7bea25d76ec8e676095513c85eecbc0/sufogosevijiwiwezumesu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/cc4babb99a62a800421b6690560ccbf4/99221579021.pdfIn PDF document text
    • https://manenshop.com/upload/files/moxifevajogamovawi.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/4012540199.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/rafugipemenumopuserewe.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/xavabumamuz.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed24f91e40d5faacf7165c2396fb5ae9/fanipelewi.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/2312305776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sony+hdr+sr1+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 10532 bytes
SHA-256: ab10cc8fcd6c8d90a54535259d364ca1e0ec580e2095ef822e520239f75f0689
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 17548 bytes
SHA-256: 5beca5d569f0f6e0dd3500c0933b8cfb13ad213fbc9906c183586ee30c776b7c
font_02_sfnt_off00011bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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