Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f673dfc6181a5e…

MALICIOUS

PDF

98.7 KB Created: 2021-07-08 23:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 977b207f8bdd71e092f06096dea10c02 SHA-1: 2204bdc78038da6801ada5db5875f46c38f4985f SHA-256: 48f673dfc6181a5e66645d220ef9026887e1dc9aa0fe9a900bdfadf020df3abc
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to malicious destinations, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 6

  • 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.
  • 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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7bfeacfb5---rozuvezoxitu.pdf In PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/ca22bc7276dd5583afe666f1b91e1fc3/31400936441.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/02e4f532b24cbf540999a0d6f1ed941f/nazetoramunotoz.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/13060847658.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160df22aa25ea4---kuzirezexatokom.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gixukexonawiwenolagefako.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707409c2622---47057027082.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/69375346826.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/karuve.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/is0giar05mpdlh0h08pi5oh1u3/65830141024.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210606000743.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210605/file/16228257177103.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda2bb750c---vowesunutin.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d02021744---52820714151.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/47fa359923b41518972323504ffd8250/95095119711.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/26008981986.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/51337636217.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a15cbbde263---bezuwebozul.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/gawemidaxekubotuga.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d3c9b8e51a12c6db6a7ee05c4350422b/fepelidodisi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9469b7fdb---tawatutorodugatevuw.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/3420951832.pdfIn PDF document text
    • http://thedreams.cz/files/19345475735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=weird+quiz+questions+and+answers+ukPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 17712 bytes
SHA-256: 69cbbda49b0c6b1eb7c206be86cb2ff4ec78af4d026ebdc6ce7574b5b8f515c6
font_01_sfnt_off00013600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13600 16392 bytes
SHA-256: 439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d
font_02_sfnt_off00014c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16444 10672 bytes
SHA-256: b75b60f75c78fa6cda8d9933fc202538d753e5ab629c70304afcb67e874b1a08

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