Malicious PDF — malware analysis report

Static analysis result for SHA-256 c487869dda4fb738…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 13:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 299730e1bfc83555e372a372a1a68e0e SHA-1: 7cd4e144c05d479bd44424f7a6999e31eb97aec1 SHA-256: c487869dda4fb738bf217b4c71b4b206765afb092f3f592f957f26d377dc0e6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=touching+relationship+quotes PDF link annotation
    • https://allcreaturesinc.com/files/files/kofipolen.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/kewuk.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608297eacf85e---67349545060.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/7a0ac175621222343f21b7e057170fbf/lojixesezafipufadod.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/nibupurelaza.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/vuzafugozaxogow.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/wirofodopep.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a603beeadda---xaxenunoxapuwopavub.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16129a4c87f894---96664096443.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/61415023780.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f89a5143f---gekowevopu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/mamibozuxiv.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/26793593973.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///rowifumugas.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/fabodejosilobedebisunujof.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdd1bd0dbc---31128593944.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/gesomanagoxixawetapeze.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/f765e0b4202aee0da924f40dd536eaf3/58528668919.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/80262237671.pdfIn PDF document text
    • http://fygl.net/uploads/file/241206238755.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/xajexubeloveza.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/78675734832.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/rejikibevibagadojixeko.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/wagujogasadinixepokeru.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb8a1c908---wasumuvilotegawiv.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_off0000bdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD0 16656 bytes
SHA-256: aa07a5979c669237438b6ea004fd3f2b50ec69953232a9db974b9e303be04b62
font_01_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 10864 bytes
SHA-256: 7ec4e0de57b913cb825636806ac0121f567ec46f498f5146a445e48896c986e5
font_02_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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