Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86b0bfb6b4ba48b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 01:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f05654ebec3dd7b26b677e04a9e0ed3 SHA-1: d662c9e79bfa9e26d262767483e12b2d29c8f464 SHA-256: c86b0bfb6b4ba48bca67701ea55d03ae83a42dadd94ce8c38916cde4ea7115aa
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple links pointing to compromised websites and IP addresses, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the malicious intent. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://157.230.241.115/image/upload/File/barodavepebonituzupi.pdf PDF link annotation
    • http://goodwill.pl/userfiles/file/49510137190.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d64149884---15357073276.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/77958465555.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/fisixivabipikufafe.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddca2b661---nerax.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/2323692000.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/wewesej.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/53491360113.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/67849997486.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210812_8C74287D37DB325C.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3ce15e2a---99795076736.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/sidoda.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/52407533649.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/66828413497.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/sffl19guh3h6kcprrl1e1cn1mt/vuvirekewudadeno.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/09c65c306060d5310120c258b517cf3c/28992195699.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/6707497467.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/2403023211.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/86138f08693ff9976131c2d7dbbee13b/fotage.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a9184a2dc3d---87327463213.pdfIn PDF document text
    • http://freetds.net/userfiles/file/75200989155.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/zamavev.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/zobawisamukawenitigim.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/faxeromopofixasuzanixo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/2m67sg9849a8nnutn3t11opaqp/45378968400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=converting+powerpoint+to+pdf+issuesPDF link annotation
    • 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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 10748 bytes
SHA-256: 1c7de62363a17d24d251d29c57a4de7bfea6d3e812e78cf9a869665a3c0f4716
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 17812 bytes
SHA-256: aac0cffcf34f9cc873c80eceff948cc48fd5812a977f267c152ff9626601d116