Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4763c697fbc9732…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 12:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 872d22308aa6fec7f7a3763012805880 SHA-1: b49789d0d8085c3d3b88f48dab030453e858f56b SHA-256: d4763c697fbc9732052c9ad1b85462747930862ff4cd865984fd7304f3877fd4
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 upload storage 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 distributing further malware. No scripts were extracted, but the presence of multiple suspicious URLs points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e03673857cb---salojalofedixulaful.pdf In PDF document text
    • https://lusagroup.mobi/images/website/user/files/gegitezapijoxatipesabolif.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/subigilarus.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/21150035365.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a83baaa25ec---90413004435.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/fakinajibofalabijukezuk.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/potanirowosipo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/lopadisulomado.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/214ee91a093eba0a1df51e71e4b50d33/ramelegevinisivow.pdfIn PDF document text
    • http://iucecb.com/files/file/76906271459.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1eu8it7lucol0gkte9d5c18u77/5209944491.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/e2gva7vks38fdehhhmv9agr975/savoxofekuzegaf.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5aefbc4964af51dc07f0f1970ad68f93/jerulelatijelaxajetiripa.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/wekogolapanim.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/20789e3dd95236b81e7ae5c2f8ed8f82/fodiwudiwepovejelezurif.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109011237418713.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d860be76eca---78626904403.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/14873263066.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acae981844d---21655492762.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/komesipunab.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/14f497e579d01d356cb666705ec6eaa4/zejukagerukibunusedenoteb.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/liwomufetokopuwesirumure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pharmacology+of+expectorants+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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 11192 bytes
SHA-256: 2b37ab508e46b929253104e0e4fda5f4791a9a566ff93167eee0cd89b9c340a6
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 17824 bytes
SHA-256: 6e34460cccde3a56d53ee6e9b72dbb4ff8ba3f8b06d4f7b4733985d0293af231
font_02_sfnt_off000127a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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