Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19964c66e7cdd62…

MALICIOUS

PDF

87.0 KB Created: 2021-07-13 11:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b640ce0a9bb76821ac643291c637693 SHA-1: a17441696c03682c16ef16276c33ceba789609d1 SHA-256: d19964c66e7cdd62bd135c2d0ba5379821899f341bb4695afc74d581e6e8cc8e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being part of a link farm hosted on compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790a6abab76---58119935485.pdf In PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/33746638822.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/pazeninadabenibukokapej.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/gfrb88ck3aggj16qsdkdrgr856/22816887025.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3a45cfad6---79298207878.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/vepitexufugis.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/45124048946.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0fe64778c5e27e4209cf38645c536722/dowategusul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd96dbb67---bapem.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8f173df4---xadufus.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923580b1f19---larixolijubawef.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/09fe335fe975024d9f3be82b84d05162/19233986720.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/fed8ad856dadcd10f51c44b5c7e199d2/sukifoge.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/denexaso.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/422r4n72vq9kt14lvlpvhdrli3/22849390436.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/kesubox.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9048fd400e---mizozax.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mibisaxul.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9b2396cf---53301647857.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/xubulevorupemoxababe.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3aceef866db8aefa9a4415139f5ac5b6/zukerorikuwegizef.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/58901823b8b4394dc13626a6c7a6db57/78264470087.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/58832624611.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/sozitewofaxatoruzed.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/pufalo.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/pejederesejitel.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607019d708685---80681268891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=general+well+being+indexPDF 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_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 10404 bytes
SHA-256: c529a382d49890928608301684c48791c4a74c2a4e652ead1576f074c0285764
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 17028 bytes
SHA-256: 8e7cb8c8797e52cff49420c262cc25e0bcdaeef06bc0c20b9d9b7d0d1ebbe5ed
font_02_sfnt_off00013683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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