Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efd3d5f06b35d9b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 21:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc9f671dc8560d03e4574d7cd86fe6d9 SHA-1: 464bbb9cadb2f1c9ef8189eba1d649df23dfce44 SHA-256: 0efd3d5f06b35d9bc635fe98bd1641857f7adddc9d2ce1d47e4c2b3c15d6ed25
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. Heuristics reveal it contains numerous links to external websites, some hosted on compromised CMS platforms and disposable domains, suggesting a link farm or phishing lure. The presence of multiple external URIs and link farms points towards an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=pixel+install+apk PDF link annotation
    • http://builderall.info/userfiles/file/55464765544.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/63363059466.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9590ec29add28bb833d31207d76745bd/rafevugunezeka.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6bd051773---gixewinik.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/gikedekofaf.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/tobupufuzolugu.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/40001176885.pdfIn PDF document text
    • https://vpmemorial.net/images/file/limupubaz.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/55274427701.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fce862cc2---nobedoxabepajepale.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/38432567727.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6aaf87929fb85712427f0b50a3f6ce5a/vitomupox.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/kibazajozukizefegavur.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///98913525155.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133640232e79---31593073740.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/91406219467.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210906_165656.pdfIn PDF document text
    • http://iviltra.lt/images/files/pavitol.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ve0fp169var4do1b72aq0qobs0/dilodipemoganoluwokotuku.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/54937327217.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/venaroka.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf8a471056---lovizutidojutuxuvef.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/bonilinaveresobivovopiw.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/zopoxujoniwivajugobu.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/70177334899.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/dawonulubal.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/83911828255.pdfIn PDF document text
    • 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_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 17556 bytes
SHA-256: 1128fe0d999e10fbed6a256a501acae97d2977ba5ef23b8809eca0081b747a87
font_02_sfnt_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 10220 bytes
SHA-256: c89399a12914c4181f6934670501ebc44598f7040f0f0bb6a77d174f9e140354

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