Malicious PDF — malware analysis report

Static analysis result for SHA-256 b801df2e00aa77cf…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 12:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04444f0f5ecf35772d8c773b325323ec SHA-1: ad8bad5535788ca40a49427340a5b7ef4515d8e6 SHA-256: b801df2e00aa77cf1cb61a0cb1fc476d9aad518a76ad114519c8e49553198121
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=science+textbook+for+grade+6+pdf', are likely used to distribute phishing content or further malware.

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://irlanc.ru/uplcv?utm_term=science+textbook+for+grade+6+pdf PDF link annotation
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612abe70ebf8f---niwavofididofifolituke.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/2ff42d19a3d5d852a7aa2e02610196d9/runaf.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/zofuketaligakela.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/coc5kvf6na3ftcc2al85ng5jn4/71904678594.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/monixo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/p9381nvqgme6nbrkhiit2c5v30/zavajefazenekitofofu.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/81964073831.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb9c7a2094---dowasejol.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/21047823087.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/ririvabalipa.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7126190b9f---70954873946.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/nines.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/70198581883.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/basosufajase.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dc1c97bca---lekufuwumupusodujil.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/17212155492.pdfIn PDF document text
    • http://builderall.info/userfiles/file/gosekosodejejopexomibone.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/kejagulajunosevijogopizoj.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/56558370828.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/2024095811.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/64628299657.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/wumogigowoparirifi.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d3533b774c04b6fd7ed69cdb34c43052/raweberazudo.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_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 16972 bytes
SHA-256: 9054f3bcdea07956d1e9279280ab6dcb66a32a903b735539f6fea97e31ca2a00
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 11156 bytes
SHA-256: ae2bef4b69d186d745c00a59f29bac250cd130f4f9e2426df0b79b261f1b72c4

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