Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b292568126c77d4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 03:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e04ab53c5aa77e58b7851b2990d41e87 SHA-1: 79a751a2f6a335c98e4f7968c34524fda202e12e SHA-256: 8b292568126c77d48fd43704250ed9d67d4413870520f6c133974c4fdf26feb8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. These sites likely serve as landing pages for phishing attacks or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=how+to+draw+people+easy PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302245c179b---71524361204.pdfIn PDF document text
    • http://esistore.de/userfiles/file/sofugejazavugilakuxobovaj.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202193235171739.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/daboxeditenep.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a36d686c---82436139687.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613803349e2c8---54523502682.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109052258205391.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/xokitutafirup.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/jumijulumolotezeto.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/petaloniwoli.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/47356216794.pdfIn PDF document text
    • https://jurad.eu/files/file/wosepuxolavunupapug.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/tekozoji.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f31276980---zexeseko.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/wonofirotufezakit.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/43784065349.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/64983890625.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/098a0dbf1c0c5a589843a9240dd5f52c/80667996839.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/mubupanovi.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/39278297081.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/gogizasepajadarevulenegil.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/78794891217.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/48971353586.pdfIn PDF document text
    • http://happy-land.hu/editor_up/22603244144.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/motule.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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 16800 bytes
SHA-256: e454f301d06a42a05a9f44cb966bd731cc1c0be511fb887beb004fd34dca04f5
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 10380 bytes
SHA-256: 2423b5b5087b86095b72cf24cfe9fa1627ebd6b50db0663e31543f191a101067

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