Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4e32d205dd36ab…

MALICIOUS

PDF

95.1 KB Created: 2021-10-14 09:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8352e0cfb2cf45e2888a3eae53a725fe SHA-1: 1804c81b60cd57fcd24aa9bd0b5c8d511bb9c56d SHA-256: 3f4e32d205dd36ab1ad4dbecf3c1c4b4b01ebbe18fd800a79d0fb2ce4782acb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 https://alebusph.centralcms.cloud/galeria/files/fatipebepakuxosofimikaz.pdf In PDF document text
    • http://chanhungcorp.com/images/uploads/files/taxexaf.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613363be7b383---83531946269.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/sirot.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/vifupujakajufuwipopuru.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/pudofebenul.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/8167981574.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450e289c3c8---88178856782.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/fanuzuxurataroje.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/76482859214.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/ruxitigit.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/76084184769.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/zodologunasujo.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/53102969152.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/kavalufizopufivunaxari.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/nikuvuwadikigikudumuzot.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/safexejilagaxuzixifelovo.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/40999320334.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/70290128369.pdfIn PDF document text
    • https://satesayap.com/contents/files/98117785484.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630803847.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/zemaxilifamex.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/pomamidari.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/3ae121323912b3e96e720cc4886ea3d3/lobupixajapibupokarewev.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=css+the+missing+manual+4th+edition+pdfPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/69705657730.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_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 11052 bytes
SHA-256: b3b36747b7e430b1529b532790191c4c1bf51da4aff46c5026d43a5633ea48e4
font_01_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 20048 bytes
SHA-256: 8c8e86109039bea88657999d1fd7b14fcd6721095fb5263922705d56591c4bfa
font_02_sfnt_off00015673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1