Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc932d057a81f04…

MALICIOUS

PDF

79.9 KB Created: 2021-09-23 21:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6b56022e7e29f4a8265261d5430c451 SHA-1: 0ec1efcdfdf57a0ed2bb7a9785c574d60613c1e6 SHA-256: efc932d057a81f0458c5a8eabae9994eb02027e69a319e97a6a544296306a4ed
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external resources, likely for phishing or malware delivery.

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 https://medvor.ru/uplcv?utm_term=how+to+make+moving+lock+screen+iphone PDF link annotation
    • http://aktifithalat.com/resimlerfiles/ginozikawotekogel.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/17239064001.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/xelovajipopokawobodu.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/52586601063.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/zokewebeberivo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de931ed936---38341416763.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614111ab5b82f---batidekafelefagolomok.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/48134792429.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/85876245558.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/eac965ed0612d5d1b2f48f308ae96864/73683953250.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/56728214982.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16144bce295b04---46129120720.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/23367364453.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/lasukajereg.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/tuginixetoro.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/14391341046131f95e7c369.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/76796381658.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/6882613635.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/jorixu.pdfIn PDF document text
    • https://autoskola-scp.com/files/66617065383.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/lokavelomilokoxegaji.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/debetib.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/20890584286.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba3213c16d---59477912097.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_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 11056 bytes
SHA-256: 660c42b656a76d1b71d3df8ac54dfc7bcc22dae0d788467eb2dcef7fac3124ea
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 16804 bytes
SHA-256: 7a8f5d9a4d7ccd2fabd81c0b6ace08901b0bb547f3b39a10d38ae519b40dfa4a
font_02_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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