Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff73676f424eda8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 21:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a584981e4ec3d524a6c63d12c2be1a3 SHA-1: 048dbd3bb6a6c3dc689889eb3380c8397a4fb4c5 SHA-256: 7ff73676f424eda80af6f7acbe84de43436f7761e0ce36ad95afff8382751d5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan delivery mechanism. The presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://nomylo.ru/uplcv?utm_term=refractometro+grados+brix+pdf PDF link annotation
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2aea57072735294b61eccfb432b5d8a4/sosegifodizefabefusojor.pdfIn PDF document text
    • http://msiutilities.biz/documents/zitekasakatiwigagipulu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a053a11f61---pivewafaji.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/92370372760.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/kpku44jt73up1ltkv2lom034i7/28202564870.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/rivanejirewinade.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1011617c---40425904259.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/vudenuzewunipepilewifi.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/gajukamokuxelebibalibi.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/bipupexu.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/viduxuk.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e5423989db7---nilesawuxedofufofu.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/4288605518.pdfIn PDF document text
    • http://fitviewer.biz/files/file/sujejopajimekixez.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pajusajujulakijaz.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98594667b---10339097537.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/94021496768.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/gobil.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/lidesisoridonapipunod.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607598d6f2cfe---82102857256.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/15861507886.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/sodovewik.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/paxeratezovijifepik.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/8896034787.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160700ed7b6b0d---39073052989.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/46157931239.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_off0000b794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 11100 bytes
SHA-256: 31a9ea61c65e60d3beb9e9af43b2c15069253e1463969037fd2391d2c2466e13
font_01_sfnt_off0000d126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 16800 bytes
SHA-256: 9a305a44d8f5c7334d490bc33950e4c4d0e4739ed5ae8f91b199e6ac33348fdf

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