Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13631a633835e05…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 23:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 984e53b70e1eae98590a788491e8bed0 SHA-1: 0c0fbcc56ad41f275f0f39120d7d50e6a4975e9f SHA-256: d13631a633835e053a3fdaa3d5ae745cb3e0568b4789472a93ca1d81049ca2e9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or exploit. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sns-russia.ru/userfiles/file/91597073324.pdf In PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7816576001.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f600d4ab733a4669c49e3e304ab7921f/japevatutiwuzozejep.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca8d5f6a5---16533609437.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/54636367643.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/dawiruvafatobepitetik.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/pepebixe.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/88868360531.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/15598186316.pdfIn PDF document text
    • http://goez3.com/10005001208290177/ckfinder/userfiles/files/65683897649.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/lekan.pdfIn PDF document text
    • http://vtaky.sk/media/file/51850914157.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/8odf26fk67b2it1hugnifafboq/68709291583.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/nizijetofugetotuxid.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/donavifavisozivati.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a50f219feaea222f62e6be1f98a90ce6/85951111824.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/visajuxonolitev.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/81381595660.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/94977514613.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/forukup.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/59540c4663664195a08032329a4341c4/vogosukijenogadabotek.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/13186470436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=danby+portable+dishwasher+manual+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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 11204 bytes
SHA-256: 484c455b4e66c204f3e411aa38a0d80126c5d96e530a021a9447699e76a7138b
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 17784 bytes
SHA-256: c7409c43f558a3d3188bebdb8337e49625ccc92892d282a306840751468c3d7d
font_02_sfnt_off000127ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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