Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a155745a0a7c6e6…

MALICIOUS

PDF

69.1 KB Created: 2021-05-02 17:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: fb9078887d8a0bd52c51848f2f2a1d13 SHA-1: e8fc683799f505996d4ccf78c8641c190faddb0f SHA-256: 2a155745a0a7c6e6fe313c62e6daa6eb54c771301b624372f68784934fd4ca60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites. The embedded URLs, such as http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16089ede0189de---13615786417.pdf, are likely used to host or redirect to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608274394469f---75303096475.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/0ditdktp27379sfs8h338bacbp/nimoxibojinibitefowaroro.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/f5d2a74da30b2fafa80e4cce935350dd/21688071042.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16089ede0189de---13615786417.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e480dccc09---85148059039.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160887e1430595---50175305172.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5lc4v6hgokmjn24dbb67h8aj6r/30349864044.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2bea4e1e---80186272480.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/e6507ac2cded727996ab8e9f5e4772e7/jatixanawakodoxulul.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/85ef2006fc0134aa12e570d59602252a/jonavex.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67004dc63---vujunajare.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/74063831502.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160849a01b8915---91320741759.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1664bba9---nakamazawekujazawometile.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/dudaginutujigeziduz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9aeba86e7---nokimitetefivuzakuvudol.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2cba4ab6c4f459a3357714fa25ca94b0/82450261797.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=el+barril+de+amontillado+poe+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 5108 bytes
SHA-256: 08540003f543fc4aa04df51b88beb403c081d07daa773cc98bfb3c8ad4a3ae26
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 11476 bytes
SHA-256: d544ff51007e85dbc5d48b49c3b2897a841a93181454015cd1d5b73f1f93eaf1

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