Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e9f7d398627d28…

MALICIOUS

PDF

70.2 KB Created: 2021-09-20 00:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b06bae53c3f3cdfb47b2d8c722cb501 SHA-1: 076bc321a9b114654ae1a3d54d71fbc1427611c1 SHA-256: 67e9f7d398627d28f2ade6998e6a0ac30fe8841ea9d88318cfa16f3b7c4eaa85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document's primary function is to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://synerhu.ru/uplcv?utm_term=download+pes+2018+for+android PDF link annotation
    • http://jplus-ag.com/upload/files/BodyFile__6147AA14679C0.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/nuredasepumobuxeve.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/kalar.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba4849f5f---84512283015.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/57499b903bd903db2fa3be2528f69b99/sedetafikubop.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/63123793155.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/rerafelanubin.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131282f5862c---80599686939.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/75431247654.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/64449803322.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/68260416339.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/659e21922ccff754a379c98079ac0ef3/felerokimewasijuna.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/88852696222.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/raperunekebudizazefopif.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/pedemukoleropovexerem.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec17f043ca---45841233082.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///rodaje.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/wibomunifulobenajiki.pdfIn PDF document text
    • https://tepihtrava.rs/files/82656678223.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vafavisolexetulorixib.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f244b2cdf6---wivivonumasidisuviz.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/38524304795.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/vujabawudunesapokagalere.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/86544114749.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/94818657997.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/tudupurakewetudaf.pdfIn PDF document text
    • http://sung1.com/upload/files/kaxig.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_off0000b427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 14644 bytes
SHA-256: e35a3be26dac9af6915986e17732471efa0de252470d7c4d3c6541d86006b67b
font_02_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 10980 bytes
SHA-256: 41ac102a26eee6b9a1f1648282a29489e3d9486aa5f6b4c6e0244b8a6a441de8

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