Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7057d414e86c37e…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 08:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bd58eab7db97a9b5a884324e9065221e SHA-1: 25d86b0bcb09d865551c09a49e832439464db7db SHA-256: a7057d414e86c37ecc883ba841601a5a58b98c3c8424d82b8211c4d84f8b613e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. The embedded URLs are designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f7de33eb3d71e357d9e02015480acaec/85436461803.pdf In PDF document text
    • https://alarrabnews.com/images/content/content/file/28488046510.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92686f1ae---dojazanunuxufuz.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0b851ee29738532b7a497130448e9e3/98803545729.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/kodatuwerizoput.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210618_181218.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a18a258304---ripewodipitevakaluzu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b530ab2740---94563070031.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609935014510c---vugosiwizifadutikigutezot.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/778124118c28d2b331e930db63bbdb5c/33124585804.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160baf4376278b---59353825454.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/kazegavejiga.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160752609019f2---fagafavadivuviwovila.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081546768210---xezobejobezomu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b97e8b7e405---tasalitefobogax.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dbe95e10f---8453272007.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/76106514326.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cda42b001---pukode.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797ddc23c6f---64230179805.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c61e4df56c82dae47192b2d39ab2403c/dokok.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/menobuxifu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a72fbfcce7e0e300e19ee62df7b21fdd/fakokodede.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c451bef133b---jefukekoja.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/93c219eb29feafccf2aa5aab11c306f6/49659257988.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5k5lid45pggmae4ut3lo0lhfm2/mupune.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4980f1aeccfd144db090f3a85b9bcc6f/57842920110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=when+will+child+tax+credit+be+released+2020PDF 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_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 16980 bytes
SHA-256: bf46b36da3b5704c8c70cd6dd29d1b96e2b7a6793ba94485e1a689f301c5f5dd
font_01_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E6 10908 bytes
SHA-256: cca85083a3cc664782f6bdb33281d607e2ba8c1e953ad2ff4eef970ef79e8905

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