Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab3161a39cee5f2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 08:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9b63ceb2271b407750ad2b86df45ff7 SHA-1: 3088bf5e6516805ba3043437288bacafc5606c7c SHA-256: 9ab3161a39cee5f22c5afa3b11cc46b2b269ac557ffceb06ee7d26fdab92e33b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are characteristic of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://tavio.ru/files/file/zaxat.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94942c6728---73337954322.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/kitera.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/4578187900.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/xukebugupusozelazepe.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160717fce75095---sokiposavanuwetozez.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/81894636811.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/27766720815.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/531a97f0ebec2a7341d0b99da5e6a9db/5761311776.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/765825fdede8e562d8fcf3856c0b593f/75131545460.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4deb66d86949e41c7f08c4f81530b645/19518376443.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1m06470o3cfgc253dfrrvuors2/mujadagor.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/12651363813.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/18576632240.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/83119970603.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/sipebivixozelesanin.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/v6fc3ct9o6mcs0biuc60s0jhg7/mezanobakaleson.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/300056405013.pdfIn PDF document text
    • http://usa-ex.com/images/blog//file/32988559982.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdcd56a2f3---tedezo.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/kavub.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c68cb878b4f---11912091642.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607c47f180f75---47674957835.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7q07uh7eepq86f91auspdhv586/budabapej.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/75694402813.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/dipafuzitox.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a62d0499293dcc116424cbf680a39c81/sulone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+coc+base+th6PDF 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_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 17664 bytes
SHA-256: cda56659775c03e79a63da76126df6c6fd5f54f818bfd54177cdde6e0235ea94
font_01_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 10348 bytes
SHA-256: 3a6543ef6da6eb545a8ca837dcae79cd4bc2d3f382544d9e1ddaa4a119209cbe
font_02_sfnt_off000120cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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