Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dc08234234f13e…

MALICIOUS

PDF

91.9 KB Created: 2021-07-22 09:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c866f3da8ac0c3a2365467c23d61b3eb SHA-1: e51dbb49aa30b34a08b944bc6dc774c185fcd43d SHA-256: 99dc08234234f13e86529447a67e52351742c7fdce26f28668b82a145554b6f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and the compromised CMS upload link heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eedb0bf14---gotugovoz.pdf In PDF document text
    • https://cafepiolho.com/uploads/assets/movivoguseredepevaro.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/dapapi.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/zoramitifo.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/silezerawitojik.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/gakejedutazetuzosudubim.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6b5e0c09fe44ccdc7d460664184bb513/20208277844.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e045d79435---61884709751.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/25424406044.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b952ccc154---95064678429.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/mamujepagelero.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/62418292854.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/patijinuvap.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3plv4e1qvgohk8kmln17900vb5/81322174716.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/nibiweguvegaraj.pdfIn PDF document text
    • https://superchills.com/userfiles/file/koganarufaber.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56e9130c9---fejiritivukozukafi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16094bcdf51a30---49276223295.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160720a15f2478---23873698642.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00d842424---mobobovep.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/xedipojanawizefuxuf.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6afc06fe1---59775765250.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83dc842d39---sivotelozogevivikesavugos.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/fotepeloduw.pdfIn PDF document text
    • http://cl-pub.com/files/files/67709389906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dried+apricot+compotePDF 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_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 16900 bytes
SHA-256: 3b953263f7ae81babec02433111d20af08eee35175273127808c8a85549f351f
font_01_sfnt_off000130be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D5 10356 bytes
SHA-256: c1502184436a4f11535a0a37ab036b076ba3ed88ca0328f73dd757a86fe1786f

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