Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3de7df4bc3656f…

MALICIOUS

PDF

80.6 KB Created: 2021-10-20 10:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6338a31ca2003e9724608cc3799d4995 SHA-1: 57ccf6ee701489eb2196ad4a038220a92a492e39 SHA-256: 5d3de7df4bc3656f72663d0352dc12aa32bc9de4314a28c82d22cf45193707e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, likely for phishing or SEO abuse. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://infrive.ru/uplcv?utm_term=como+hallar+el+area+y+perimetro+de+un+triangulo+equilatero PDF link annotation
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/85338440147.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/negetoxixiv.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/tesusokazixifitifaniv.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/fosapu.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/kipoleximeb.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144b0dd267ad---musoxofemepago.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/94643031869.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/95711344207.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/maxegizegipazunekikuki.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/12509794678.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/monexawovazawemuwibasokik.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/webimelamadisogevem.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/39861156401.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161302f127063d---zibolibaduxovijutaviwu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161699984c7215---fobewekawirijokowe.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/72724068802.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/pivisijowekuzofokibulam.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/17297312165.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/3220313367.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/14608093297.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/84585891278.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/dojodaramegijajapopidu.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/dukonejajerar.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/77577721261.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_off0000cf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 11060 bytes
SHA-256: 96072abd41c858a5277c65961e2e93d34fedcff309ca57291ac715e80d70a635
font_02_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 20204 bytes
SHA-256: 2bff2d663419570ddb34060c17bc87437915b7e7a30d432157251b83193167cd