Malicious PDF — malware analysis report

Static analysis result for SHA-256 08689053483b4670…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 04:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c26daf8c8049021c41b446192f2b703 SHA-1: ff5942929b5270ac9b621d29d21548bbc829f418 SHA-256: 08689053483b46702ec8c2b5f9a05bb5c59554fb22c3eb3b83c01fe261bb461d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=nitro+pdf+reader+8+free+download+full+version PDF link annotation
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/hj7rkldguc72cdick716vhb72fkqt0sr/lejozebutarukutorozosu.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/67260048965.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/42264903337.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/buxuto.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/72085413886.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/japs0cre72rv2n0tbctjr0cdep/57443513542.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/wesofu.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/89773442397.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27dcebe8bd---koforududogiwer.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/pgp5c05cn4k18mtdjm9c1d3ep0/kibulul.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/sutifobutixidepolu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/bn8nrdith9vsb32n0bck1u248h/97752018155.pdfIn PDF document text
    • http://whatdwellswithin.com/file/48110882218.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf68670bba---xipekilibejojewigur.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210506162825257587778.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/93091037353.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/voxovo.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210831_092356.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/84584238764.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kuvudu.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/58541770469.pdfIn PDF document text
    • http://elskenecologie.nl/files/86394172850.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3b45193c---5682641049.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_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 10928 bytes
SHA-256: fdfbfb200220fb3e42fd5271a8a9b51e8f045da4e717dbce282c6d2b7ed8e038
font_02_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 18452 bytes
SHA-256: 9253bd8834091a205c6da4a75addbe5a2bb0f5ba9831bfe25335d9a257a6d8f8

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