Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc8391126f6c560…

MALICIOUS

PDF

130.8 KB Created: 2021-07-18 16:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1090b72eafa8063f4a354ba381a7ae03 SHA-1: 44f77b0d0e8f383f365be0b254e6f641657d7ba3 SHA-256: 3dc8391126f6c560380fe9cf2c16c62a8cbab8e7ee7846e60990dbdb9a4799b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501084518151497.pdf In PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/8e590f63a7ade5f82ae4b4907b8d6a22/48634982865.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/76606084779.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/rurelosofotorano.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/40488424493.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/gisebawozepixukezekokoz.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///jiroduzanejinukikeko.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zosigekuwuwobaxuxen.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/c954smjo3qv5ojrp1b22tceieu/12874792993.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c12jq1ckg8b1av3q2vets6luk5/49993463645.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f849da2ed5---5198235575.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/tasemujefelizibef.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79bc078c3---pesofi.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab944a91ec0---517539076.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/a9c7rinll4ktvvumpc95drsooi/71983721837.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084675794364---62965971352.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b48338d41ae---11822976593.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a87f7e2de---56894802717.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09526ad544---kudufav.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d4c696e02ff377ff5220cd53d3b0c64e/mikovowuwukofevo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb45174a96---93191854543.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/84848449466.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160944f80277b8---mogufopusamez.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ff80d40d---25828751570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=university+of+delaware+physical+therapy+protocolsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DB1 17400 bytes
SHA-256: d136e7f254e4fe394bdd65bcbca35392b5557d596c5475265288122c8ca0c21f
font_01_sfnt_off0001cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB7D 10992 bytes
SHA-256: d24faf0ee923b5272d44fe3c4a2cdffc2131b59be1b008636eaf65391985b165
font_02_sfnt_off0001e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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