Malicious PDF — malware analysis report

Static analysis result for SHA-256 f821a4e63934e557…

MALICIOUS

PDF

96.4 KB Created: 2021-07-19 15:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6285c86af33c05d431c2efd6e8a571a SHA-1: f59fd1dc1776cb8a72cd6ae6cc5d88f9363d9287 SHA-256: f821a4e63934e55786fc2fb3893726408dea8b42d7b37384fe403c4aae7c7a56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The document contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term' in one of the URLs indicates a potential phishing lure related to saved Wi-Fi passwords.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://champion-osk.pl/userfiles/file/nikurejojo.pdf In PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/fazeg.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/birijusuzipo.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a3f5829b20d003e805e1168ad75fe88c/zoruladanixebagigodaxeg.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba816d7a53---42535566015.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a98457b9---sogefazuguzef.pdfIn PDF document text
    • https://virker-ikke.dk/files/dafovagomiguvifuxime.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/vapobewiketilimekatoti.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/i71t5c11hlqeofuv52iglbr4l2/6666062647.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b497878160a---farituxuwog.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qenc6v6ktlpol8lp9e3777rlrj/98424698077.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ibp9pio8mgsegk0i3r4pklt3a6/jikewinimokewa.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/sepuvorinafonotodeta.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2cd61156---numupimigeluxajeja.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/ramatuduwitu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/3ge92a7kppkaacpp8qckthhpmj/xovajikuzijaw.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accefeb2510---pizifa.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ace09f0ba88---bakotodagodobolexeg.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d86b5daf3b7d24c407c09b19ed75a011/vazanuxujivazax.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/83718750798.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076edf38329a---3098505805.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1061165f---94724749193.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83312858030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=saved+wifi+password+show+apk+without+rootPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb5dd1de3---19161778944.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 16088 bytes
SHA-256: 0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf
font_01_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 10864 bytes
SHA-256: 065dac2a1cae61fd59457771c7d0cb1f58ec6c32d91a7fa3418de5ebe99a810a
font_02_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 17448 bytes
SHA-256: 4807615970452941b8e365ccca7c12cb2086f730bc703d49b625397a7ae5de63
font_03_sfnt_off00015b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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