Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b1d90cc2201edd…

MALICIOUS

PDF

107.9 KB Created: 2021-09-03 19:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c1d11e8dc68e294c46c0049f176777a SHA-1: 9869e01b90e85297df06e1a533b43f324fa26c7d SHA-256: c6b1d90cc2201eddfb559e54fbcb168e69b6c313e08147708c5c4bc7ff8704ff
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, designed to redirect users to other malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a08acdeb234---38103938765.pdf In PDF document text
    • https://eubeer.vn/uploads/files/dolisoreribab.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/nurinubumikilizupuwola.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/defuvimajitejowu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afef2281144---74013532299.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/xukisi.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/xemuminode.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/10248086401.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jetaguki.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9a758c92---97528846111.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/18040264587.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/68541953431.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160e553af64e2d---91264900833.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/20066628819.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d53418d8bf769058fbe60a315a75886f/90857409295.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/sazabuwagokav.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/55757424851.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df12430cebe---pesejife.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wunenilumorulonu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766f9c8124a---50903266473.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/xulifowagurejus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bioptron+manual+de+utilizarePDF 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_off00013ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000154e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E4 10600 bytes
SHA-256: 3c203249f046500d273df083b49f31af7fcdb088c7959cb8e0d1dd77fac31a2a
font_02_sfnt_off00016d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D15 20788 bytes
SHA-256: 3db9e77aaeb8c9baf3f2c3bae626bdc1a8186ba2bf6da4a44cb2e64c62c18916

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