Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22b9e0938027ebc…

MALICIOUS

PDF

84.2 KB Created: 2021-07-05 00:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a96f9b6a57186b4ae6bdb2424598934a SHA-1: 7ce5bb91f7dfa4a9742cdea26119ab0ab6d517b1 SHA-256: f22b9e0938027ebc0ad7e3c0097fc26418967d28dd7bd2c7cc5b05ab7e58793b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a569010b4---bomabiwemalovunuwabawepek.pdf In PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/p08g2lgq7sfvquvsrj9nhgija6/12292545693.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5jk914q5qua337ml88gmqg8amf/11422713078.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf879f694---xoxotidemodajovudaguwa.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/nogenix.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/98896633398.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b400a4a1787---2588824046.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/83687905868.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/76114801850.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/89833576664.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae107ba82---96246951665.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ad9cbbcc1---89581671515.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160beb52ec75ae---82684966967.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21a677e3e9---rodogefaxirewowajilulege.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c038c4d11---46090869638.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e3f0d5dfb1ba6b9957394e327d4ff374/71117233868.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c6275e436923b165aa61075d537651d4/6620989801.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160855409a3e14---fuzef.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/65761912384.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c847915b3f71143f6bfcd540b0a4afde/bunejemusipakozader.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rid+of+clutterPDF 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_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 10180 bytes
SHA-256: 2479f178e66264d23ad88b8fec6a31a86f2a949af297bd9af75b49b45267e551
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 17980 bytes
SHA-256: d11e97bce026b865e4f828d592405fd9d4e16f5f7e4c9ea3b1007046387af3f7

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