Malicious PDF — malware analysis report

Static analysis result for SHA-256 6570d11719b700e2…

MALICIOUS

PDF

86.3 KB Created: 2021-05-10 05:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 72a4f78ce520273dd495b9d498797d27 SHA-1: 1fe48c1b9d352cbf7e9b657ec833988f9b1c8dd7 SHA-256: 6570d11719b700e2c1cf4579f21af60fd7e992eff218aee3d5e9606e251aadd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/n0cdfdtr5br5jiqveplboortqq/vegaxawunano.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0525e08b4874bb59477263a89678c36/jaraxopekazovufirujisoge.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/verewadijuti.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607123c3b4ef6---63765597857.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/vapudetetesefosolanenoj.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e393c44f67---vogovasodemowigurupafuxi.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/44ade2cb8a5b3fadd4e383766ec6b108/92844620087.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a51f35b0d---34517818708.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084e62f00f0c---woxukomerod.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mtsqk1cvmk4qj5j0cdvlv2c1v3/36265852873.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/373eb6ef60970dafd6863c23fc865158/sadabibafum.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609359001f3bd---263543220.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b28edcfd68d7f1ade5cbdda47fb20a4/82082185673.pdfIn PDF document text
    • https://agatanorek.com/files/file/sekufukajuzo.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d2cd066b1da2b545f7487a4a923694e0/kazejesurara.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xolututefupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=arabic+alphabet+pronunciationPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000121ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x121AD 25204 bytes
SHA-256: b94f4aa54f76c70efd57c8bb7e442cedfb493d5376411f49f438e74c2ea78fd8
font_00_sfnt_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 4972 bytes
SHA-256: 9a495a34ad0ceacd6fd94873beba8125e94ade41f4027b35b43f879b5f2f1551
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 10596 bytes
SHA-256: d483d725938850c71a1bb9acb1a7c92ca630763349ec4516b9dbe88f7e2bf1fd