Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f59fe5b15aad745…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 21:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12bfa69c9c8a884116b7aa2b5c27a469 SHA-1: e0e0471c8394d4aa00be3abf88cc13180db39332 SHA-256: 0f59fe5b15aad7456c36af96c314c84c3da4448ee820f9f992bf039d11591912
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to potentially compromised WordPress sites, suggesting it is part of a link farm designed to host malicious files. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is intended to trick users into calling a phone number, a common tactic in phishing and tech-support scams. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135151f7e91d---sovadigivaretuwuxupuxupij.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69817142f8---37416082228.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f2826055ff6fb5bac2bea2581e024bc3/nutonidawegefapobudejosoz.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de0a5b00e05---fepabi.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/lomabimuzewesuguwepabona.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cdckv36niumips2j198pg0tcq0/91004291512.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1ead2af5---49402787358.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5b09a1d2c68cb790ca1e37eca75aed11/9819319284.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/bbv2f5h4ho6rn1olh57359dga9/32729058612.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/58618549636.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/29661915627.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/vizositotunesajiwopas.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c126k2uurams4oa1d9s7guole2/15278830022.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d779dff7---fisuza.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c6e191ff---kasot.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee3576869---narikuzuburebenovez.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050900570729.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/73345014082.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/wudesilelu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/80680484023.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/ratajosivaridoz.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4d51db2c---woturanenavurufim.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5190ec914d---jisovanitoda.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7ed62736---rowigiza.pdfIn PDF document text
    • https://elemonbg.com/Files/File/kaloxexewodamevabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=volkano+bluetooth+earphones+manualPDF 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_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 10724 bytes
SHA-256: c750f890eea6c720be5d86e161964858a6f1d055ec8ca247ae90aae09d0bd049
font_02_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 19064 bytes
SHA-256: 00dfd58a1d87ff65a5121892c6a24396f1ea0eff6435f3e62b5d5771a94b2483

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