Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e7dc56d9581c65…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 20:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5688678f574b0b9330bb510815f64d40 SHA-1: c9188da16e272fab05cb8be5658e1eabb7537ada SHA-256: 88e7dc56d9581c65f5f5dfa9fbeb729279f630fe14236760d90788ba228a643d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains numerous external URIs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm. The presence of embedded JavaScript further supports its malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=2020+ka+vidmate+downloading PDF link annotation
    • http://a-kamen.com/userfiles/file/87723270336.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dd85e852---40354583333.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/11714427163.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/xevakugosewodonanozerep.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a767c27316dc4080c495449877ab2354/75324103004.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/xevojuwagotuxu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/65d2be555963c5114af402eccbae893c/12468207758.pdfIn PDF document text
    • http://castel.lu/userfiles/files/xofuvitebitukilodifan.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/jevenadoravekopisuwiropat.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/60867100918.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/gaselewajudo.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/30120258.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/fugemufuru.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/kivuj.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/pobifutefalibikad.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/rekapugunikusobimu.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/92722950059.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/82281761685.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/riduvuforaxarusez.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/11503469593.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gezavop.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0d80c870b95b1df4886d03fc7ef7842c/faropaw.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/20237760554.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/sifaguwisotezemawokewojob.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_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 10712 bytes
SHA-256: ae98d8df29f582b3bc0695319c8c1a6aac4ad5cedfe9e83b1261d76cd43c7c99
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 17996 bytes
SHA-256: d4c3827a10ebfac8506e7e287aa1a7712926e710ae0664de5a60c2fcc0e992e0

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