Malicious PDF — malware analysis report

Static analysis result for SHA-256 6965643445da0d70…

MALICIOUS

PDF

87.7 KB Created: 2021-07-30 17:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d015404c9702913a7e5adffd3e0b50a8 SHA-1: 06c1c9d4d657dadafd2e375f0ab6a3066ee833eb SHA-256: 6965643445da0d703b1774f7a21253d1f42df3ad9ac9c5e1e9368bf4d52707c8
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. The presence of numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely involving a Trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=inventario+de+intereses+vocacionales+de+angelini+pdf PDF link annotation
    • https://copperscraphandlers.com/ckfinder/userfiles/files/29198660264.pdfIn PDF document text
    • https://securitydm.com/slicice/file/vedowixapu.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8092f30b1---juwikuki.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/73248133559.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/63389904652.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01ef6adef---piparivaxotopo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ziwowirif.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774e7aeecf3---pimibunesedijoreki.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c294c2a4fcbe79ea8054a840797d7434/nodejamorixopuze.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wezigipudubuziwuwadul.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db41fbd2586---72146707168.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/44017822473.pdfIn PDF document text
    • https://mmszke.hu/files/file/2356522864.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/limevuxosatuxofoxok.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/20722607770.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f5f688d3037dd80ca002413c992e7b78/17569773858.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/17921432621.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/14236440553.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/37625127092.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d5e58c5a7---busafukumu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/eca6b778ef79879414b022a851d2c5ae/34199284863.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/zelipir.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/pemijamokolusawo.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/kojuliwutibuzakozux.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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 10812 bytes
SHA-256: 553ca1916c7f3426219a9b635ece094b489ef995f750e132da637568458dd09f
font_01_sfnt_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 21216 bytes
SHA-256: 63b04775cc829f761d488335361453fb530771907a796f4f01760983ba759ee5
font_02_sfnt_off00013703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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