Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a982242aaaf597…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 19:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22110fd90a28ed85dfa8aaf877ba3bb2 SHA-1: c67b2d47d9feff9adb8b15df37c1e93044b9fa28 SHA-256: f5a982242aaaf59724c4e99cfead63c0cf4c860f64e9eb17e39e1dc8f8819b74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs that direct users to external sites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or tracking, further supporting a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=risk+management+and+insurance+mba+notes+pdf PDF link annotation
    • http://whatdwellswithin.com/file/2889440062.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073539d5a7ca---bugomatesuzasativo.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/ranajipapar.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/93094491226.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/23201984944.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d029e4212ee453d1b24f20250a1c8b3a/kagotalagafu.pdfIn PDF document text
    • http://vswet.ru/f/83835184323.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/218dbfb14c898558fd7b5c8e89a05817/67599769410.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/29742003141.pdfIn PDF document text
    • http://jawarakreasi.com/file/lewulaxezowisopudisidi.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/22199689158.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/miruxepiruviwafimupul.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebceed1eeb---wegovufevutasuniked.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/jabudolifurumadu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///92459282036.pdfIn PDF document text
    • http://superazs.ru/images/news/file/goduni.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10cdde3714---86607153294.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/woraxekazo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaad0dd3b9---94316720956.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/31934966318.pdfIn PDF document text
    • https://onwater.my/uploads/file/posikimikoji.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/517037c9fa27d75da814ada5af30bbf5/20778597917.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/268dd6e7eca0608343a10d0e2ec680d4/zezodovejasobosugi.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/zakoluweroxonakabilabote.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/gutr1e9l84khmjrh3vijg6rkf9/67267948462.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/90126201782.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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 11296 bytes
SHA-256: 840c50061a9edf72de259336b6becf68e78ad906ee70a7305d6fa281169909d5
font_01_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 17860 bytes
SHA-256: 7cf056dc98de961addfd7940a6e48e0199fb04540b870ccba8be10d3a9ffad42
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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