Malicious PDF — malware analysis report

Static analysis result for SHA-256 998fb501d5e79edb…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 20:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ca04ef84fc7a0d2a612e933ced8142c4 SHA-1: ab8d9170c867f0ad7a1e72bf908a448bfd3d4160 SHA-256: 998fb501d5e79edb1e0d4534f7c9778e5b4c1c6e7bffae2cd4e86735a419fcf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm to direct users to malicious content. The presence of external URIs and the nature of the heuristics indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=aqeedah+wasitiyyah+pdf+in+english PDF link annotation
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c167cf52239727f16b5cf877ddbe0305/firaxukobode.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c428e9c99c48d948613748b7f9989435/jakolilofivofodug.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/79609014299.pdfIn PDF document text
    • http://haphadoor.com/upload/files/7979633458.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a14609fbd---xudeze.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/19420850935.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/xegakeloteso.pdfIn PDF document text
    • https://emmaushuis.org/pages/gufesofoxido.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeabc4076f3---49419900212.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/30917083867.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/depobimepavofusuw.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/katonaxokekivozu.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/rodotebufezadapedowinalot.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062103101936.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/5101879664.pdfIn PDF document text
    • http://htwy.com/upload/file/nuxuduxovirumotunesazeb.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/kaxunet.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hhv3pjkoj9mjlib9grie94ph24/guruju.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/86sgd4gao0kma11rm4nnnl5ah3/tivinefo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076fdcb5d6b3---85874831805.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/7rmjc9o7i1oskrtrqlmql6ekud/72747142786.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdffda5b50---82934992320.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161098ef695817---gugero.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1ev04ldsc5ib0lbikpi5fg4sa7/lozowuzejifise.pdfIn PDF document text
    • 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_off0000c4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C3 17168 bytes
SHA-256: 0d1f450c544dd1950844497e976759b33b6715b80bd8b8628e5ffde630fd6495
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 10884 bytes
SHA-256: 3fdda5286cdb37e27bbffd923c54738fce73e260be7586983aabc5a9e27752f1
font_02_sfnt_off000109fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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