Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5083eb0dac5569…

MALICIOUS

PDF

87.2 KB Created: 2021-08-18 04:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e71bcf8ec5df8c499fffe9f9a4dec14f SHA-1: b4b47783ef6c3eaa80c8e835ec9aef702ae95f3c SHA-256: 7d5083eb0dac5569c0710ca7d3139f6f47896fa3b7acf658c1ea3a52a211200d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to host further malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 8

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ferropula.hr/files/tezuve.pdf In PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/vomamul.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77abb9453---60119031405.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/72be31a587e6f9012b2b098e22090ad0/segizola.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b0fe9039a---74571444818.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b49a9616c---50474495854.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/68735390730.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/41197852747.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/53911765262.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb6a2c9b1d---57911398102.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/gesixuvedamibefurukene.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6aba02465717f4fcc2ced253a6f187cc/28107529684.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/gutenulevelugedomekatowan.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34cee74a---juwadimizitabagan.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/40357525572.pdfIn PDF document text
    • http://topstec.com/d/files/74047282767.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/93288166271.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97bfad0ef---kitewarigariroxo.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a099c0bd97a9cfc27ce4ef237e4d4ccc/nugomoxonujenul.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///32956406145.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc5827b18---zavifutebukukizeduvofe.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/74997139411.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8010ae25b---rinikikapuxitadid.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609853240418e---ripamubuwixeruguj.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112fbe5752c2---zepojanero.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402f6907a3---muzifixal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+atm+can+i+use+my+paypal+card+without+feePDF 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_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 17108 bytes
SHA-256: 7163334b4713dbfa593109142cfed664f81c295ab2e862a33221543db8f9cbea
font_02_sfnt_off00013347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 11176 bytes
SHA-256: a81271714e41b7747b737d23f9f043c85e8577da9b1dd53af608df856becaa0c

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