Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73959f10a69df3c…

MALICIOUS

PDF

88.8 KB Created: 2021-09-05 06:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50666e4f9dcebbb1e8246da7b1501eb6 SHA-1: 8127c0609d6b7ef0d02e0963317fa12dd390e019 SHA-256: f73959f10a69df3cad8942abebfef109b3bcb6b4b4c375bff07e2b4a6ea5b4e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://laborke.ru/uplcv?utm_term=mazda+2+2010+service+manual PDF link annotation
    • http://emilygrilltogo.com/uploads/files/36692389436.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/kibufiwuzow.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/jinovipapu.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/39325567327.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rokabalivenuwomaz.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5475bcb5dcf4d84c52468e00b9f43703/fidarasisenoket.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210815104305.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/19642044928.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/31476449407.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe685d01c0---zurijavinevademu.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/vezokesafefujizijugine.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/bv49grljl0852n903qt2rloaen/xunewobodapododi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9212b1bb76---69710678377.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/s5a1qifvsnf8dluarfisdo5n7q/45792239777.pdfIn PDF document text
    • https://digireg.dk/upload/62130475779.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092dca230102---puxutezodozebol.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bc666939eb4---85765005573.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/letazibewuras.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c796174202e---fuwaturixoxo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/spvv3u1m1p9t7jnn28712ouvk5/83767639155.pdfIn PDF document text
    • http://puisan.ru/uploads/file/danegugitefekawazan.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/19431826362.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/wilanataxogokexoneruse.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/41574228401.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_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 10824 bytes
SHA-256: eed5fdefa699416c7e8b0cd9c391cd4a9ccd3dc19a3c893ffbbbb5d4ff051972
font_02_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 19616 bytes
SHA-256: 083c1b9b331a5f313501a68a670fd4e9d1823e7d81f497abddf85a5379bdcfe8

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