Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0ff3306d25d0b7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 02:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb4ee402dc9abb1b5247f8195932de8d SHA-1: 52d15af3cebe24ef7e1d51219bdbca7254e7a048 SHA-256: fa0ff3306d25d0b708c0687bb945f3960f2d167e689461023deec847bfb228b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/kijumifuboxewubazixakuju.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6649797b---zujol.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29230585ea---vulirinemomegubesaliv.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/4ge2p9tkg6qgdvml3lk61jotoc/53822322549.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/migexopuxuruzajobobirodi.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/69411476753.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/5271085743.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/mexenojikedaxoxi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160744179c87e3---84339103273.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/lukup.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1bbcd2e16---jidiregesodise.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/86780054305.pdfIn PDF document text
    • http://yongqingtech.com/d/files/82221019407.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/kefos.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160717caf1ff6a---daxokinugix.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/senoxupewetu.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/tujafo.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/53022067664.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210714_8799302CB99FFE24.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/39207449088.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/legokalox.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/tikebivujewelopem.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/93276525065.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c1c330cb---48173947808.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/76826605487.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/0cghrbrjsbja7mq2n0a96narpt/zabefonefexililukemewanu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2e30cd187---97633037072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+learn+ms+excel+formulas+and+functions+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_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 11060 bytes
SHA-256: 8804cbe0ad6042393c51d556656f920c0a563d1710751ef356e9da0257e96282
font_01_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 18140 bytes
SHA-256: e1d24c301f016203797ee14b478bbf72a2056e9493a02f9c98905fbb2f50f90b
font_02_sfnt_off000126b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1