Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a289810e828d27…

MALICIOUS

PDF

71.4 KB Created: 2021-09-04 19:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8bd599384526a4a19bc9f115184c7d50 SHA-1: c3d13402d55055f9e95dc850a66a328b9ae152c2 SHA-256: 39a289810e828d275f4a046681cbc10fe477acc67f03c967becb8b950e5718e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage attack designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160848417a6d7d---tubulig.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6639405c1---sopavuxuxixemiraxeb.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/6a92fc9b90317a0ad55fae2c2cb790e1/wafisido.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3fff8929ddf17ecae177c2ea73f79b3b/bawupodikizeninowokur.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef86cdf200---41816095776.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/9179671075.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ff47575e---10056941000.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a777fc515d083ea71fb4f816926fe85e/fudafabakevapimududaw.pdfIn PDF document text
    • https://lemanssrl.it/file/15262716059.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/mevazavegid.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47348be2cf---43537645655.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/46686134655.pdfIn PDF document text
    • https://denimder.org/resimler/files/pirugofemifejunuketo.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/912f61cef93dc383fb3d8fdfcb1c0d92/90553275371.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/64c507e30275e56da297448596c58683/suduwabelazikozazinen.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66514219261.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8da88bf12fba44764cd6c31e7666595b/zabonemujexutagitem.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/nusisizipiwevudizev.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/vedegugadesurifulod.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/45u9c0ai6drpfvn3f9nse1cfva/15141892252.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba27b26569a---19614148377.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609619423a246---jedolugojod.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/82264271148.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/baxerapoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fases+de+la+meiosis+pdfPDF 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_off0000b700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB700 16224 bytes
SHA-256: 5d38828849a04167ad493dfe404c04592eb5359a2ffdc54eec5ec4b54ed56528
font_01_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 10332 bytes
SHA-256: 1151da440e21fe578dedf82ea5293c433743c965483cb42b4de241a9963eb1f8

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