Malicious PDF — malware analysis report

Static analysis result for SHA-256 973df67a64e7f320…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 12:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d6a4c0658fbc8c5916486ec0f5e1c84 SHA-1: 05aed807986b8ed0e92a3b4d9aa8d82da4450efe SHA-256: 973df67a64e7f320b75e11f149015a4fc86462fd61dc2204c898af221729a453
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=cafeteira+cadence+manual+exp302+preto PDF link annotation
    • https://sasalidayanisma.org/uploads/file/watiwitaxugasuzizokibiga.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210812_192029.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jvel982ptt6i07oeof7bt5ofin/76639602085.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a9884d826e5d39398edb574089b12f5c/65228712967.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7ed02a8b5ad25d844947cb3233277190/58786766034.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9537b92c2ba6838fd9d8e59634b04ea2/jufibej.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/jedujapofanasololokeguwor.pdfIn PDF document text
    • https://bselink.com/userfiles/file/xaxawiluxuxox.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cba689c04a3---bogajogumokinenexun.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da91c60d8d0---36001826226.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210813002701.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/74362557890.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/71825319497.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98d3be3db6---kabilerodesof.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/sulaje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100490017c0c---nawadutetujixixokoleviju.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/41945228568.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1611dd9ce8e053---xixemofiledajori.pdfIn PDF document text
    • https://elemonbg.com/Files/File/mokegepora.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d6b9eda22---gutoseposunojab.pdfIn PDF document text
    • http://amdind.com/userfiles/file/50527777449.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/75238902525.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/parin.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/964e6c416988f6ee03db7985a4ffcb55/63992818133.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_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 11260 bytes
SHA-256: 2ee3430ec08b5a0b3657a015276456438f7539eff842285dc7e674a80bbc0863
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 18576 bytes
SHA-256: a581c085fed04f2bae4f104275305ec9593adc8ae663456fe61f21af8c3d3801

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