Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d54922c45ecb8b6…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 15:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfbe29bf65d5f4cfb977f3f71ecf53c4 SHA-1: c4e2d40466b24a06de035d12626cec7f1e3ebe24 SHA-256: 8d54922c45ecb8b631fd5111e6fbac39d4f107c8a1e84cc80e9f4160599ab28a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of numerous unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095cca62b7c1---wiluxumuwep.pdf In PDF document text
    • https://artbynela.com/uploads/file/neludixujadiwipojofumara.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/51614752266.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb9c334e3---nadegukirexikowerubug.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/zeraxekonileroxud.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/4on3qrrms5fksnf7fqgu7mubf0/kisusomokuranimapepofus.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/rududafemadolotesofodugup.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/84536412981.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8f3bcd71---98264282168.pdfIn PDF document text
    • http://askort.pl/Upload/file/biruwosexuluvevuweve.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb06c37721e---kefedifelutesowux.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/48477868392.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/tidejenidi.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/cccb88006730bd425249860b1e96a390/nafitabu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161219696e12fb---84762283470.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/tubaxoxasosibigijekope.pdfIn PDF document text
    • http://dzbnf.com/upload/file///21847060159.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/tosiwidofesobegizunezipi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ec74614ae2017f9bae32f9c7271d7897/wudirekav.pdfIn PDF document text
    • https://maturana.cl/upload/file/ridebevijel.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/67035025141.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/83f94147ce52d1ca537d4b38adae42b4/83818772634.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd318b824---1601502155.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/79094741193.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6706beea---nudobebataru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=6th+grade+science+benchmark+practice+test+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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 11204 bytes
SHA-256: 207213d6db933711b216365cd82ce92e7fbcef209ce05e2dffcddb8f75395fa0
font_02_sfnt_off00011bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFF 18360 bytes
SHA-256: 3423fa82462310010dcdda631215ec40741169e4fdff752cc4dffbcada226dc5

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