Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c2955528117127…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 12:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad60c5e5fa459745e2eb7aac69c4414b SHA-1: e58481a0dc1114b1d2118e4ae9a004d3d2511c1b SHA-256: 43c29555281171270a9a389b11333eb3f3e876e7ec84d95001c59de0a856cad1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to 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 malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=croods+new+age+full+movie PDF link annotation
    • http://itagqatar.zajeltel.com/itag/file/files/78613772677.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/solojutosoxexig.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141643be921e---jikobavepu.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/64812751797.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/55281487220.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/52530449278.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6cca39f8---88295291043.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/jazibitalalanenisomo.pdfIn PDF document text
    • http://ubest.ru/images/file/zudumelofilijapixakuka.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/kenobuxesotopitapapiroto.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/guxawifemudi.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/luwedoronosirida.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/loronanuwuwig.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210917_2A1A17B7B90723E0.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/97899796285.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614830b4e20ce---webokanupaje.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/55947090912.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134720837c61---53640875652.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/58129122798.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e193af8c---dovidi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117a6e1fe9---58000621359.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/tekivapafimoxapivixo.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/felotefol.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/daxefosabo.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_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 17744 bytes
SHA-256: a02cb8cf21bb807be063111748cb5b71a981c5bda97637161fd43ba7068ffc92
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 10884 bytes
SHA-256: 760ba87793e158c446294e267974d0fe5439e95bd082ca1e188ee6b812f5d537
font_02_sfnt_off00012892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1