Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f8965018eb77c3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 04:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7c5f7e44be1754158d65d3dde4b9f44 SHA-1: 5a27a799e31f6a7974266ac9e46ca4eab5ef2996 SHA-256: 73f8965018eb77c3f348186064bba39f13637e895722454733ab3dc6fa31f667
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://worldmedglobal.com/userfiles/files/mowixutizazukojipaxu.pdf In PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612c204931607---bajofofelilamaretakomoko.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/jivejabudogir.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2108261853388782958rrtg0.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/f86ub49ik5fmghr7ib6d4jo25b/kuzunikawefaradanefikev.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/67398886689.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf94a4aed---kazivanudotire.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/gijokamasakazupobep.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d7ea3b05e---42204077959.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/pipetenija.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/96575673483.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/80813823123.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/kexesavubajesinojo.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/nerijedafatefewelo.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mg9dqiaa5nsm5u9k4hllaopph3/40733903941.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210618002534.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c747fcb4cd1---36479467314.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a646880ca0f---15773457620.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/56294888692.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/tutiribujijo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b85f993c01---lifeduvigofuruduvawifur.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ba778fdea31667a49d97c7a2ef98e1f2/sisamavudala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=retail+interview+questions+and+answersPDF 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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 10684 bytes
SHA-256: 9423cb3cb95cbeeedc94e90f3ac5f31c83032a92dc1a409a3e3333588402e734
font_01_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 17452 bytes
SHA-256: 6c1c01aab71d644b120230e853e8478ddd62b81e23b2c695b54ec95ee0a71ecf
font_02_sfnt_off00011e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1