Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed9b53ca9d468de…

MALICIOUS

PDF

99.1 KB Created: 2021-07-16 08:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92ba890ad6439f8893b511e328e15bd6 SHA-1: 3c5b20788f017176c9474450936fefa1c4f9cd29 SHA-256: 6ed9b53ca9d468de16c3eaf5625ad006c711a7559f01830707956f82864a4e83
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of a 'Fake CAPTCHA' heuristic indicates the document's intent is to deceive the user into performing an action, likely clicking a link or executing a downloaded payload, which is a common tactic for spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://crysiq.ru/uplcv?utm_term=discord+chat+format PDF link annotation
    • http://soflocops.com/clients/67403/File/kewekizonomi.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/18576727237.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bb40959c7---75632661911.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050517492378.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80a6fe8728---42737812831.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/72f76be0f6214697c4b96355639a86ed/raxewixe.pdfIn PDF document text
    • http://zxsolar.com/d/files/6490902903.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085038063145---mijowadodis.pdfIn PDF document text
    • http://faradbox.pl/files/file/84305874565.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/xoxajasipubukis.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/lewadabuxesetumosuda.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/77i3gg2td7ma3ntk1thpck4f0b/faxijuwemowogonemaxuxiju.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b4fa19ae9---67487320081.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce534087c---67592500857.pdfIn PDF document text
    • http://vce34.ru/attachments/file/sonibezibinirusigexe.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/52362479436.pdfIn PDF document text
    • https://fishboat.hr/files/80697271878.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/07qn5af56kigr12iselbbtkdo3/lidabelob.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e23df54c2691470fb9bbc08b248f3f59/56495953770.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23b39b24e---55795891891.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/81834554265.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/pewisonodevugutomotab.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee880779d62---56273930935.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/fajuderen.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/63330516305.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_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 10460 bytes
SHA-256: 97276989512f737fb92bd97a9e1247a4b73d4bb9d960b8f140df01fb519c926b
font_01_sfnt_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 20652 bytes
SHA-256: afbe46dffb10833800e5cb152a58fdbd144780a72567c07a9c67a609367062cd
font_02_sfnt_off00014f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F14 16344 bytes
SHA-256: 756b691c13b983eafa03e47aa9f0b6ad58d5b72d5a208688d70894321573a878
font_03_sfnt_off0001653f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1653F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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