Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c547c060f304e9…

MALICIOUS

PDF

91.8 KB Created: 2021-08-01 10:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6fb8819610ca3b1d3a72096c0cf0fdef SHA-1: b318f9d4955ac2de3bb5135839ad5b7e75a26711 SHA-256: 77c547c060f304e91c8b9e451adff3eab9e43165b1199a682636642d03eca0ea
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=nonton+video+boboiboy+the+movie+2+full+movie+layar+kaca+21 PDF link annotation
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160888dcc6373d---tuborojefusavapevemelite.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/6jp602s6g47ct2hqisvag4kqe3/3921589832.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pizet.pdfIn PDF document text
    • https://superpart.com/files/zobikavuzujekavanasupufo.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/sipibimovewusi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b8a6d0e56---75636264585.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/gedewadadebevove.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/bazixuxagifupi.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/09e5ef9fad1fb7ecb25d2d3a999bb05b/16698752848.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/pegixazupodevedabekuzo.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/jupebikotipiloxi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ff3481854---samibolexojidowow.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e9aed712---94521718644.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/kezogonoza.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/mumomuwubivelugiv.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad5d72f86---32104184366.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60ecaf16cd---kixosufe.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/bizowikagebokagom.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607891fc98247---wuxaw.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210731221842.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/6362505583.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/javubidaxidiwig.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9il985i0jujr1451milfct6ua9/75182018754.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 17824 bytes
SHA-256: d07f430cb17a79d7a7a327a464ba6fc96a9e876737608ac5821650829e1ee6c5
font_01_sfnt_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 11232 bytes
SHA-256: a6563bbf3c3fb9f1c91c3a87d9f3f0032294fa43e440953a4dc3f5414925df8f
font_02_sfnt_off00013daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000155b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B7 2248 bytes
SHA-256: 66561d23f2eb1695a39bb9f88b80d9683298b042bd99b179776941a2f3878adb

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