Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00a536e052d59a7…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 22:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5826151274aab3ee70688f13c92c9bd7 SHA-1: 45ac9007870ad1a31ab4f0d2ff56805bf8519f59 SHA-256: c00a536e052d59a7b4d12503c9e869d4552cf1384dff3e9b1c00cb74ac91e450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://hamzalegalservices.com/userfiles/file/24606561168.pdf In PDF document text
    • https://hotelexpert.ro/uploads/files/zukozuke.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/gagumajotunalure.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/68711497709.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/bozapuver.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/64599608454.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/tidatod.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/29265897421.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421605ccfad---laduzinilofaziwoti.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/xasopivu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161321b0b8caac---5022011803.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/sd43v6klnncj9ijjpta0fec5dm/86648134018.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/61498959586.pdfIn PDF document text
    • http://synphabase.ch/upload/file/64231251679.pdfIn PDF document text
    • https://turbooto.vn/upload/files/17962945606.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/xomadabefololanawet.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/bipodokuwetasuniju.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/385627216.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/badesegusuki.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/musinavezeref.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c48a0437---dixidapedujujenaxur.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140929241dcc---7601680904.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/pireriruwazoxewiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=iron+man+comics+pdfPDF link annotation
    • 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_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 10456 bytes
SHA-256: fe0f57d786c7c74bc744b9e3a4f66e58e5aacfde564f39825f7dd65e7a5ea416
font_01_sfnt_off0000c740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC740 16028 bytes
SHA-256: 6eadc318f54a9102a25a827a15da10d697d56797392e74edb8961e5ddf85dbf0
font_02_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1