Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ef489c295bfc36…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 11:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f72cafb41eafd4d4e9035b2f049aa5a4 SHA-1: b6bc7971223a295b15378386c5097fb8f7e098ba SHA-256: 79ef489c295bfc36be926eb780e7e93cdcfc6d926ced705c9f3428f0b60305d2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The document body is heavily obfuscated and unreadable, but the presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://podiummagazinenews.com/ckfinder/userfiles/files/relodemagonik.pdf In PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/dibojen.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/10059075276.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/29135925280.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/55132731621.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/33907689578.pdfIn PDF document text
    • http://honda-vo.com/upload/file/4224379845.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/fakamojomedefikofu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155855c8993b---464385168.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/18959476460.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/pobige.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16156bc32531fc---nenepow.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/44008149977.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/sipativasirifumaz.pdfIn PDF document text
    • http://all-premium.com/user_file/files/59485405214.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/rinunisugos.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/34804597425.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/88375165238.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/47743131367.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/momamuwewofalarijenano.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/lovobani.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b32114b3---49605721692.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392efb1a4a1---86559156474.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/fufagopisotesu.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/gedobigavabasonumawes.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/jotafebewofanesero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ias+exam+questions+and+answersPDF 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_off0000b4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D5 16248 bytes
SHA-256: c02a2b2c3b9d33bb8430897f6ecbd305e42c25edde5acdda7f4f68660c77df0b
font_01_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 10748 bytes
SHA-256: e94ea1f68766bbf48e9973e2f3740e8198db948567a90a80c9253e212cacc52a

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