Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f006811c9f4f3a…

MALICIOUS

PDF

74.0 KB Created: 2021-07-03 01:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1af71cbafe27dd20dd57e7bf63f9c31e SHA-1: fec5d5ee09f28805ce9c2a43b8fea5e775d5fc4c SHA-256: 99f006811c9f4f3abf1a793eec69cf1abf1b5471782d194dcb110a50bb1385d3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0218bfed9177b43b999f7fc5f216f755/nudizelobuza.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ce95b6f9d---kuvixokep.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/26644962516.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/47320294947.pdfIn PDF document text
    • https://proxus.nl/file/32079382870.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607230ed63c55---pafoj.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/pezirojub.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/49179453752.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/73004329315.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/zibefefagewalufomikok.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8b67c902b6ab3375010c4bcdb12ec5f5/durumumilufikilonalaturi.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/xofadomebabupidomi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ca93638a---fibofam.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5e4365e440d1c1b03f08d9e9199a5b79/fuwewoside.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/xonaliradop.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41cd5f209---tarapowikinumomabufises.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/ribagexanuz.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d19ff04a20---17376088536.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/dakoxoretedamo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098417799d3e---62656499233.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/tevenafenupanibadebopode.pdfIn PDF document text
    • https://coevent.ru/upload/files/85771245176.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210616154633_nr6nll.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/23954566589.pdfIn PDF document text
    • https://hiroyoung.com/data/files/paveremoluwula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=red+roses+too+what+a+wonderful+worldPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 10592 bytes
SHA-256: 00a5aff62f7555011a67371dafb0f9e4d1558340badd2d11ab3d2199f7a12416
font_02_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 17232 bytes
SHA-256: 2b62b503d409e73cba055e1d5e51529239a2b708fb68b905a1c2fbf2c5c2a128

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