Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b90ddfcf5a6b13…

MALICIOUS

PDF

87.9 KB Created: 2021-07-16 09:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e728a09a6299d0db7549b23365bd7666 SHA-1: ab8844d660591dc4239987d5bf4610dcd0f24499 SHA-256: b0b90ddfcf5a6b1317191b76bbcc01336eb05631cb7a84a0a500e1ac7866ac60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/uplcv?utm_term=home+renovation+services PDF link annotation
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/12a3d7c5cebvkts5esedn5gq1t/73690198120.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/renel.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67954b350---7566891568.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/90732631950.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/rawunude.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/23609947540.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/65386621332.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5480d5add1ba7adeb42a182cf1d28a44/sojogekik.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/8033545163.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fe33946b66b23e9db7c2bf910caf6de7/11231196339.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/gopoxemanuxo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/3559274247.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f22c28d2a---momaposodigexovobilisojuz.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/238f15266cc6e16cfb6039715073c18c/62002001063.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7m1iskm3qnonn0c8btpa9601br/98540427078.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/52249313208.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78bd94cb5---48400718410.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/96383445825.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c74d76223---joroda.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160737cbf8f72c---pitibuxodijako.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a9deed39---28938853131.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/kadojowonaruforataxa.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1269ecb63a80c8dde914e99772992ed0/77253532211.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5cc33a3f9---97484860715.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/26638184173.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_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 10404 bytes
SHA-256: 8371e40f54c9e686f3f0e8a7d44181d17b26cc3fea30abdff1e04a11b3d30793
font_01_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 17256 bytes
SHA-256: 6815c42f28c3c62704224f52146d3f0f81500a4663022689298a8ecd493206ba
font_02_sfnt_off00013a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1