Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3f3edcf00261c7…

MALICIOUS

PDF

90.7 KB Created: 2021-09-19 02:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7428852d972245e5125db375636b0101 SHA-1: facc745ddcb6f53e12bdc0f19c408f491c0cf69c SHA-256: cc3f3edcf00261c70eb9e1da8af0baef396337884707dfe13259106c799a4d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the document structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://pixomot.ru/uplcv?utm_term=android+emulator+for+pc+windows+7+2gb+ram PDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137aee9b552a---23176884976.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/78288313019.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/53399275623.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/91902800665.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/silafurirebajexosexewogeb.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/36913471074.pdfIn PDF document text
    • http://strahyi.ru/images/file/13588416736.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/65186680923.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eaa45b7d8---51578802923.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/14630773238.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/1049952182.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/76207103154.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417dba9f89d---95558691939.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/metagozevup.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7464b2c78214e491bcc2bb3a617fa1da/lozagageruxeximegalusewop.pdfIn PDF document text
    • https://kultmotor.hu/images/files/55894438054.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/52b78cd7a382d30e3765feb5c0d363cb/dokupu.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/87179821754.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/95832505658.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/47792995606.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/73115399288.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/lolaxomuviri.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109161629392284.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2ac2ccbc329777a7da394aa3aea12a1b/mibutujowaxuwut.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/83001307307.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/gowepun.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ca1cc36ecec738acb6294af641e9bc89/regizavavojowemopodok.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_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 17536 bytes
SHA-256: bec0656d29ca42639cce40af6863653b82f04fe60d79956d28fca2cc872aec4f
font_01_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14146 11440 bytes
SHA-256: 3fc4bf9b0b5fbd7a512ad6aaca2767495e5ce5d884b1eee7219dd54f736b8c67

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