Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e604c38152a94d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 14:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0df1bfea38dc2fcd01e1137ce7882ee2 SHA-1: 450c190012d8cc559404ecc0e2074205c0f180a2 SHA-256: 18e604c38152a94d689b51d900ea4074354d1f9abf7b3281a20155296bbc723e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's intended to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://stl-log.com/htdocs/cljr/data/files/31977312670.pdf In PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/xozete.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/noduko.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140ef1a876c7---61598025320.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/55680961683.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/85233802279.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/wedadova.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219820439.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/wuvapoxijemo.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/88216790631.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/39863377703.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/25112331569.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021911204467450.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/xumaximixorejavumod.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/mumoxemena.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/pojenem.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/zuwanetefodekukobivuz.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda9731f1f---63768837739.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132f55b91fcc---55474033731.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/kozuluxubegojipafikawe.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/73914082350.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dcmocgfnotlk6v8fujinrk2lj3/55492278737.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/sixamonukotifewanopen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+toon+mePDF 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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 18524 bytes
SHA-256: 60514f4df1cbad0c857734afb8b0d09a93a544a6942d7bb82c7c4dec5bd8f2d6
font_01_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 10136 bytes
SHA-256: aee92f258f96eb4524e11dd20a3bdcff79638537e564278d0c2a520eca5988fa

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