Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ba2839700f5579…

MALICIOUS

PDF

101.4 KB Created: 2021-06-29 06:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3dbfdb35f555f7600ee2e6b41a2f62b1 SHA-1: d6f380954c313d3d25df5e5e25b94b41b71b2649 SHA-256: c8ba2839700f55793bf33070d4b7927b023b44bfa985fbbdaba325b48b6b8d6f
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 probability of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or scam pretext, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5aaaaacdd---batejepa.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/muvufodukikudipixavaduna.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/959888764326c492a9c6e7fe70a1be32/doponenerax.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/gubuxadeko.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/liwizatu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb44052495---44193698971.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/cuu9847ri4h0s7aqs1d5l02lt4/pezitixogur.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/fc4c791b13d8b58f272c3fe58b0ac467/6744209799.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/23026138836.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b91dac7273788c38acf041622c9952ec/29965888159.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608537fbea4d9---34621643649.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f1b27369---77066962762.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/zufidijizuwamusikabikala.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717eadd9c07---bibilajiberizigome.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e3493d779b1675fa32e1ff46583b6cc7/vepidununonukobefe.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/kejere.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d56b600706a---birijesam.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/cb9d09fd55d121f1ac96e8233f2baf4d/87867246371.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/38121560583.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/1a5aa91ac45c2e27e74cae5d4cd32e1a/rapodawoza.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/limuwa.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f17bb80e6---54490743095.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4797ce40b---11593687539.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9432a891b---64404035685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+are+the+3+basic+economic+questionsPDF 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_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 11000 bytes
SHA-256: d90b055cdee474a7ea91f445f34be1dff9e79c0c7e4695b699a11a9f8e8c2eb5
font_01_sfnt_off00014114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15926 17972 bytes
SHA-256: f049985db98e3cf755f4e75fbeea0367a7f32c3dca0b5a85e3d4e51f380380a7

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