Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab72e559adbde0d9…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 04:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 86afb976f1ad83b1e1e6b8b1d7048f08 SHA-1: ee597e336367d1bd36e268832e94a3f471346142 SHA-256: ab72e559adbde0d90bca8dfed7c5f39cb6acb0ba394f3d0c0abde58774ffb371
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the heuristic findings point towards the document acting as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=introduction+to+cryptography+pdf PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088667a9eb98---tofufosokikokazegezodise.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbccb20554---tepuzelud.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2039d223---xugizunifadeg.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748baf202fd---86616457500.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kcg6k8oacj1licmckthft760j6/14264779830.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ae38f72fec8---86062392695.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/fibide.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/57836542544.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/45350710977.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/mokekafuga.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af99419e3bf---63364845914.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/mawikolabuxananig.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/kitoviruxedixi.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/293073ab04bd40f7c4b2ce1655d69956/41987828631.pdfIn PDF document text
    • http://www.siposferenc.hu/html/45160988732.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94472e7b5---nokuzekaxusabefor.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5fc54e244---xowivufule.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e3518e08a4eb0610eab5cea6038d7a4/32642474602.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c211ce5f2f---lubokigivizibizakesixaju.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/82a634fa80b2eb0a4222a2eb8d89c2a0/67200671322.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb078ae25e3---pexadewobala.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3657441447d7fcbd67f506455f09ee58/sisuxodu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/63b29521ae3cb61430014878b7a9ab2c/79481018867.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f000fdb814---gawidajaxejuwixivule.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 17072 bytes
SHA-256: 20571182d1277a18754bc489708f0ecc562c141c109ff7bab5be8a491756cbfd
font_01_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 10716 bytes
SHA-256: 903e6c6c79c9cfb8c5347a9566946a6d25e569ffd8fcf38cf6e85158949b2184
font_02_sfnt_off0001310c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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