Malicious PDF — malware analysis report

Static analysis result for SHA-256 d422f53b9737277a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 03:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a94b424fdf7fb89e758d2c531302eb0d SHA-1: b978e9d0b05ca49a19212677d95a97ce3f42d1da SHA-256: d422f53b9737277ad61f310ffbb45503bd5e6e78d9862a45eb0d8bc5f325288a
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm indicates an attempt to redirect the user to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=grand+theft+auto+mod+apk+android PDF link annotation
    • http://konemara.hu/userfiles/file/9929314458.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/1248253918.pdfIn PDF document text
    • http://apicn.net/upload/files/gutugenugel.pdfIn PDF document text
    • https://clinicscrm.com/img/files/nuluwitezofibafotowapati.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/99906365526.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/32954444581.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/61931952511.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/kebixuk.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/simuzuxegutom.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/palikozok.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/72310705953.pdfIn PDF document text
    • http://szm.hu/userfiles/file/gitefedavuvi.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/87919889753.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf9b06dd1---97896455503.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9a0b792e---lafaxijanagidonipoveraru.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161332d243640d---woxutubifolosa.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/vubobom.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/sabuvitazivotixaligofegaf.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/takefomawi.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/31458570869.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/59cf5010f6e473e603f0119be1e3e872/23014020284.pdfIn PDF document text
    • http://soc-in.com/data/media/files/52639787729.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f613aeba46---fenemevanamazixezoza.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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10780 bytes
SHA-256: 0d8dbc5d0a4fb9ed27e33a5ed0d10d0cae1d022e2f83c31b07e962918a6294d9
font_02_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 17584 bytes
SHA-256: 4e01b999d4f50d7c0296b88cf136a937cdac050754ab632b3b4d1fddd6a771be

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