Malicious PDF — malware analysis report

Static analysis result for SHA-256 31aaf6ab253280d2…

MALICIOUS

PDF

88.6 KB Created: 2021-07-16 13:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f9480643f2c1bb31a8d3bf61de13f64 SHA-1: d3f7f6e948eb75165086f9556d50e0fc426c033e SHA-256: 31aaf6ab253280d2d2c41f199145522e0a7a33983981cc453da432505032e2c2
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer, potentially to facilitate exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://catamma.ru/uplcv?utm_term=creating+pdf+from+images PDF link annotation
    • http://faceless.me/userfiles/files/wefaja.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4c4ae38d---bedenuf.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/judop.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/40b30b634807fbff3411bf02337fb403/94787757826.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac541ebbd76---junowetunogolelupitumij.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2coh8mfiaqcfgdfttui2m0f0b8/11505503754.pdfIn PDF document text
    • http://naucseto.cz/storage/45737582426.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bd98f2c24---kupifimitotafi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6369dfe01---60243860557.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/sedoximirenixa.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/gepejopijefulozevulidef.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820b28c8932---94690644021.pdfIn PDF document text
    • http://laduses.nl/image/file/47973592592.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/mexizadesonoli.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160957085c4dbd---revoxogetowarafez.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/61336880183.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0a0474e0db74bb57b09ac4ef8e9a8cfa/67632676470.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/zuzebofoxatijawawe.pdfIn PDF document text
    • https://aashianarealty.com/file/1082157642.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/174e87r28tvccs7217c55g9r84/35181361193.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/28794242604.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/kekus.pdfIn PDF document text
    • https://arendic.cl/files/mokekupojugadarobuji.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f65d9711cb---78025780163.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/14200670941.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 10828 bytes
SHA-256: e5476bbd7362740ed92b85b8110575dd6a1a327f86912e436223f950b0eca202
font_01_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 16912 bytes
SHA-256: 5075e7342176ee107e0adeb6c7e0690337d96f851549a178c45f28c16aadb15d
font_02_sfnt_off00013d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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