Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ff915a17cfb44c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 23:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f496e028bc9a669c060bdd66f5778a74 SHA-1: a016779751d0003ff11fd6e5639c9da8e69c3c4b SHA-256: d6ff915a17cfb44c1407783ad46262f200f641bb03e196fe0f7be30c66b75b42
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 redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms points towards a tactic of obscuring the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://etalentlink.com/uploadfile/file///2021081617043092.pdf In PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/67959174488.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/dunexofinexewunixonidog.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a421cde9f2a---45932814389.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/lopalazuwulu.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/16982969365.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210601205451.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/148b97473868d13f0ec54992875db63b/51827741527.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/dce9342f61c9dd96a2aa70bae568a9bf/17629811189.pdfIn PDF document text
    • https://zold-kommando.hu/files/16292717039.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/dowupoxeti.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/upusak.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/65478925105.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc0c130f0e---wozalizijopa.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/zofajadu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161294fdda0e03---85884227848.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609db82d75109---56885923725.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/83482646191.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/75401007417.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e55e7a4be1---87751636795.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f727c51aac---zujaxotixufole.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/waremifewopetasujizijenul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=convert+pdf+to+doc+appPDF 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_off0000ba2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2A 16416 bytes
SHA-256: 3306a83c8fbd34d2ffea06b896d34d2c9858df523ba3dec3ba0573ee15ef580a
font_01_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 10404 bytes
SHA-256: 74893799917099f4b46ab73e3efa6bdd67bd27e814d6368825280067a7577e7a
font_02_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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