Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1f2d4f9b07eeae…

MALICIOUS

PDF

91.7 KB Created: 2021-06-28 04:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9220b39c9924939faad4a26e4cd1f6e7 SHA-1: 9da472d323d7650e84d539ffe12ebec8b24524b6 SHA-256: 7e1f2d4f9b07eeae5927b8716f2698ba43bfd7382e9be0bfa7b8fb42854ad71b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the links suggest the document is designed to redirect users to malicious sites, likely to harvest credentials or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://coretry.ru/uplcv?utm_term=payroll+in+excel+sheet+pdf PDF link annotation
    • https://atraba-holding.com/userfiles/file/lefemijifagilusapev.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/govazozubilisejeloja.pdfIn PDF document text
    • http://olympusflights.com/files/files/45509745523.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/6igc0lp9edt0b4e1e7d4nel69e/kepozavobikizunik.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/13a0d69a820aff21d5b415c5c87dad10/30322531775.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/rokugun.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/181dc8c863ac28ad9db1c157f83b412d/76989270735.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/dbokdmj9d7939s3es8e5h0pkr0/degalemipuxudipufelo.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3900f5a07cebad3e0ad640c4ad9b8171/68486561671.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/nalojafedobozofif.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ea7d4d6100a17d54314c0821c29ce0df/64538422588.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091450667f19---kudupotetofij.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/dezifoxegovit.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/vitewoparitosopito.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160863f0fca992---reravevimawovidivogoz.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/gatiwe.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38127b92ab---54541424120.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/nepusirusexez.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/pataliwesepilivejabet.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c7288dcfaf9e6c46333a2a3a65bbe27b/79394964723.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/67a01bd1d44c5e820ef554881d1d2fac/pevokotazapozejorivipu.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/eklfief5tqqd530hbk34hqjslg/97806590763.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b853c009821---2343473718.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mhgguhe8if7r06f5kdp9o97so8/bojawidozenevamem.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_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 17336 bytes
SHA-256: 6b201c7c716dd66cecd07156898c6ea301dc187a940d6272ae1f032b81db4ca4
font_01_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 10932 bytes
SHA-256: bda6c62aa89bcb9c9ff0a253e5e10bc0be05160a81aafdb323386f5463d56ee1
font_02_sfnt_off000149b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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