Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e388ecffd9453fc…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 01:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91cd53b1728df76c6386b0610ba4217f SHA-1: d9e80e6f27c985c481b560cff90b4d867b7e64e4 SHA-256: 3e388ecffd9453fcab333b4cdf69442ecb4af7ba2811f426d0f52fb6a03cd505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, aligning with T1566.001 (Spearphishing Attachment) and potentially T1059.007 (JavaScript) if any embedded JavaScript is used for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=lots+more+food+addon+recipes PDF link annotation
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161325b6272189---nukomegefovetepipuwujut.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/60645236025.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/vanadifejisi.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/fegodekerijagasikubope.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/gamamujejanazotunitisiwo.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/31004573208.pdfIn PDF document text
    • http://wjcopy.com/upload/files/dujipevotup.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/sajixarope.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/7786763887.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/29090550493.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/93531514618.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/55100277237.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/78736016709.pdfIn PDF document text
    • http://cristalensi.com/public/File/51711267773.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7327d552d2e54a3c3a66987b73b2d657/gagagububafito.pdfIn PDF document text
    • https://kar360.com/resimler/files/kuvupedux.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210910053625_fogwlh.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/zerewerozizebikesujawexol.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/dijubokawep.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/vejipupudaroxafoxuxokon.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/930d5t5dttnddnnbccqjnivffs/suledosujeb.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_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 10692 bytes
SHA-256: eefdd3a64e33327a8d149ddba52a928374b88cc4fd5829ae322add9680620045
font_01_sfnt_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 17476 bytes
SHA-256: df63573aa28ee9e80699319fa43f80cb2fed9dd886831b97d2a259110ed02015
font_02_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1