Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d24a92af6f9f83…

MALICIOUS

PDF

90.8 KB Created: 2021-09-20 06:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1de480030968f5aa228423b031b05dad SHA-1: 69c871c9341db2b27a47b5ecf3439a87f00b2139 SHA-256: 27d24a92af6f9f83680c88618f89283f271f9ec2bf998b623a26c003f0cd3dd4
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host and distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://vietsonplastic.com/uploads/userfiles/file/sogowu.pdf In PDF document text
    • http://xutricolor.com/uploadfile/files/57860072726.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/76914183368.pdfIn PDF document text
    • https://network-italia.com/file/94794022778.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/90029749892.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff4e23d94---99303141170.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/pemexevixofejaxorixebi.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/99440182661.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/xemivilupozugozekudopol.pdfIn PDF document text
    • http://capital96.com/userfiles/file/62787360931.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/30374130238.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/54661035328.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/16989093323.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/pajowabirora.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/disudadalikumudogitik.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/ragaxefelativosawigow.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210913_4_16_45.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/suzimijuzejexakinutopi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9ac9dad4---pajusezeboxujotujubopo.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/wuzebajivumexemob.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ff50f3ce035cfe12eb3091a51b7533aa/lebuxex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306b219c250---67924049168.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/lesebu.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/42828947664.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/33113306689.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109072038488520.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9bbbccde---91068922674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+guy+123moviesPDF 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_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 10644 bytes
SHA-256: b998f92a483f95b11082f86d308979aebc0737a1cf7b0f48ed5397df0df6c636
font_02_sfnt_off0001298c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298C 19760 bytes
SHA-256: 4df39c12d3c841734872930a357699d07bab0e03c6904aa0b169274b09a7de89