Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b491b92c394a72…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 07:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7592ca264bebe23b9c179eaaf66d7451 SHA-1: 684a64095485d42d75a843fcb222d327189d6bab SHA-256: 72b491b92c394a721b9c6cd2f5da0f0925ead6daf170d27e459c407aaf76cdf4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded links pointing to various domains, some of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://exim5.hu/_user/file/kiluv.pdf In PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/penowexarirenuxedawatu.pdfIn PDF document text
    • http://pk.mo/userfiles/file/luforowepu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/80013c480e55d47cce4f5d876f44ac9e/topilovus.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210905171118.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/gejubapiwajemiz.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab7633050---melumugila.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/nesadimovamofazalij.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161369ba06d4ad---17607911486.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/vuxineredepudavuxuwobitup.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/19792907344.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/fijibogadabifemalogibe.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/19222568243.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/76713667089.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132ea4d627ba---26793442641.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/bawikiwajigaf.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6c7e64cf3eaa65312eed30c2634addd0/92323131556.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/29414837897.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/selurafoma.pdfIn PDF document text
    • http://mylodge-naoshima.com/52074225577.pdfIn PDF document text
    • http://offerparts.com/upload/files/56715524025.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/5005105912.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613187c776ff7---ninedufopobaviv.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/15783121044.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/winodazubemuwoduzebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=amazon+prime+video+for+tv+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_off0000b41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41F 13680 bytes
SHA-256: 34494a4934fb6ddbeee9c967dee10356f6c0c3cdfcc120d5c97af587e00a1e5e
font_01_sfnt_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 10644 bytes
SHA-256: 4b051457f6d80900a083634381c88d74975964134475747e01acf2e41491dfbb

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