Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2bc7737e01cfb6…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 02:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39ce0d2a3e8be3f7b9b0ecaf65be2253 SHA-1: 05b7ce08bbfc0d45a6e6e4c179ab72907e8bff06 SHA-256: 1f2bc7737e01cfb6b8c681ba497f115df975abb07b203a8300c9b842488dd5c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the nature of the links and the overall detection profile point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sriagasthiyarastro.com/FCKeditor/userfiles/file/daxikozusokijobukesot.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/617580e94dd28ce306188b8f0b7b5109/zutadukimevujuse.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327d6013268---xozowobipedobudodukar.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/vedanepebi.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/49930960917.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074465a2c190---pajixewexubajujedobilin.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/33130720684.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/94741078717.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/xifozasebagala.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/fubonezirunoserenapiz.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9cb113284f0fa08ee3873dce84c2aac3/tusuwotupo.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd353a14a---60480738627.pdfIn PDF document text
    • http://mcutech.net/files/3012151251.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/30616558581.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/32465839353.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/5127743595.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161210cabe3714---23663513418.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf53a68bbe---82755145018.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/somokuzuri.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/033e5dcb9368ac99c91ae016e21bd4db/82805400190.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/98107986360.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/kuxelumesov.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4ac445d4---noxepuzozabejo.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210828015519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=problems+encountered+by+students+with+ofw+parents+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_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 11328 bytes
SHA-256: 5d4b3fa84481d5215d3c32674fe60be6f64fcf5c036afc375b3cadf3c040d9e6
font_01_sfnt_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 17476 bytes
SHA-256: e79c40e764f78f6f753ee48f93376132f26b53cff78b2d10118c8bb77ace2a4a
font_02_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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