Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d9f15f943741cc…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 08:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c77b231091187cd4ecd7c3f2616dcebc SHA-1: b4a1033adf2945b7935d3aff4b07821e9dda1386 SHA-256: 05d9f15f943741ccceb9e86fb449403b869b150689a597c49ac2c2bef81daebf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chrmglobal.com/userfiles/file/79318975064.pdf In PDF document text
    • http://cncforginghammer.com/d/files/27384722602.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/tajujiroxajolojo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613612dbda407---77431453691.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/91726471960.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/zasufan.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/pukewovuluwasidado.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86aec1d30---kikibadaxumubezijamej.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/83463624523.pdfIn PDF document text
    • http://telecycling.info/files/file/46645282095.pdfIn PDF document text
    • http://njchemland.com/upload/files/59081032400.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/37291451549.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/lofusimigapu.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/dobulon.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210909195330.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161348fdfdeafe---lirajimemexekepalibed.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/ruzexunafex.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/loxogen.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/mitamusirot.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8069d41c088ad78699aef04bdd335a7d/zefasuxorul.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f3674753---wukemowofogewabo.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/79589612430.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/rupogawovubekodab.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/15644472228.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/juwoxagebifofuje.pdfIn PDF document text
    • https://ijp2.com/contents/files/16236327187.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/turajojekadupodiditunefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+ios+launcher+pro+apkPDF 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_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 10792 bytes
SHA-256: c516b2f7aad63cc0e2d66a0ce0158cdb5b3dca8261f8bf16f00be9b609b48eb0
font_02_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 18324 bytes
SHA-256: 040d6e179440ebec8af3b0c6bf342ed5783f580374e0b46f73ef569e895892c0

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