Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c145f24ffb68e1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 13:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c53eb3d0fabdb5fd9ac008f538b56321 SHA-1: 493d84c235c0ccf74fbecfe23e233c5024ab4fce SHA-256: 66c145f24ffb68e1f0bc34243728c91b6d77fe56ac788544a292a725f4afbe59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c34c8314---jiwibudo.pdf In PDF document text
    • https://zemtechnika.lt/public/site/0files/67880602476.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210630_D2140A9D5F17D9CB.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/96651781128.pdfIn PDF document text
    • https://ubranni.com/uploader/files/87608418291.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3239b20012---79556707986.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/sikaru.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/kelunubivabigajesatofuza.pdfIn PDF document text
    • https://blokhol.com/upload/files/vipexixizefi.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///suwanenovuxopesidez.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/pofibobovajinokot.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/mokasufapovurubaj.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf280bcf70---25008614177.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bb0437c7---7971061694.pdfIn PDF document text
    • https://medtek.vn/storage/file/20156401539.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16087a01604a47---4588115128.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b9a3879bb04fca11f253c4328c44d34c/75335580986.pdfIn PDF document text
    • http://www.heatandgas.com//EditorImages/file/27378376114.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d92da0d50---60775862714.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621491810.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae447c24c60---wazemurodi.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/nofugavelorufenigonax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=phalaris+minor+pdfPDF 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_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 18116 bytes
SHA-256: 2de03feb62f4f7305c1246963a1ffc7794912c856d08c81313986d9632dda475
font_01_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 10532 bytes
SHA-256: 57e3e4665e1b9d3ce12858f7c530ae7fc81b83b49844d2b3f35873167e02dd6e

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