Malicious PDF — malware analysis report

Static analysis result for SHA-256 67513590f0caace8…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 10:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2592f0a7cdccd23625e554ba27e9b5d5 SHA-1: 1518f8ce9e03d4874a5810a3e819195f5b87b058 SHA-256: 67513590f0caace8bc06957416a81fee7c185e73cbbad3e81b5548bcab18e3be
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its purpose is to redirect users to potentially malicious websites. ClamAV and ML classifiers strongly suggest malicious intent, specifically phishing or malware distribution. The embedded URLs point to compromised CMS uploads and disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=rich+dad+poor+dad+pdf+download+for+free PDF link annotation
    • http://mwflower.com/upimagesfile///57310792662.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/h6p0all9gb4i7r1heiish6qmca/pakuxaxavifolebowenivaxuj.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bdadedafd---20545457601.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a139bcadecc---xamutibimaluli.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0c486540426fd8b72beae80ff45788fe/zowonaramalaw.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/napipetupusoguba.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec90d5fee---54105139124.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/97693210183.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160742c856d20d---rozipekine.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/kuvesalobu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zenigixar.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/1867123202.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/123851be79339915bcd6f1a3ebeda76f/20073780191.pdfIn PDF document text
    • http://regmac.net/userfiles/files/79081667966.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/28504950915.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4e65d9c6---supugobopefovokemi.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109040727261014.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/vowixa.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/64012314200.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/kukezivitaxamokezeganuxo.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/b617779f5ae563ecf07a7c3912d53b2d/55676928352.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df7adb3f908---xebevupibin.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/76bilcrf9onjdigtd2ucqpdhme/reluvofoseg.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_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 16744 bytes
SHA-256: b58336ef745f26f9f10383bbbb608d1b0227eddf2a5e5c705951b01ac8e55259
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 10584 bytes
SHA-256: df6632c33eb5bc9a2c12fef287d60e7404db7c10d35d7f63672793bc5d6eb349

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