Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7ff3de7d9a26c8…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 22:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 876fadb6fec27fb53413cfb4989bf23e SHA-1: 53092795e617affd3958ee3d02d7d381e2654d0f SHA-256: 4b7ff3de7d9a26c8235277106836435c5fadf8fde126b419eaf2745a02a086b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ea039aeb3---deduso.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a451b7edf---xorexubogoposowetepu.pdf
    • http://cokhibaosang.com/media/ftp/file/sirelubotago.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ec275dfa---lugomupenegusuval.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a444d1acca6133523ee3c30a9e67bb67/73798109607.pdf
    • http://tafgambiatours.com/userfiles/file/bekawawonefos.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/748e7c5d9c5552562a7d45b481faf2ab/97303089022.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607979849639e---15498045670.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b5ba0c745abb1cf1eea9fd5141b80aef/86347511822.pdf
    • http://bensonlandscape.com/editorData/file/56588868011.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609f7d182d248---fonuzimaliluzud.pdf
    • http://htwy.com/upload/file/zufibepi.pdf
    • http://www.klimavill.com//data/editorfile/winuguf.pdf
    • http://novussiteyonetimi.com/uploads/file/91935429841.pdf
    • http://abwcockeysville.com/uploads/files/nasigamabosorotitafekuga.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3bb207bf1---1122044175.pdf
    • http://sevenseahotel.com/uploads/images/files/2515386859.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d581b9c0824---vugusogurorenawe.pdf
    • http://bpsstudio.hu/uploads/12379323248.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/45580411958.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4cb8e6aa5c10e8c7d08adb65d0110ba4/63188747185.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=150+aud+to+usd
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 16792 bytes
font_01_sfnt_off0001006f.bin
6aa9178836be5e141e50836aff2174eaf4802df7cf0fdf3f5bdcd4692a846155
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 18356 bytes
font_02_sfnt_off000130aa.bin
7ece8c3b8afb5a2be3bd1df218e7e98426cdc8f9201c81d2c8add950cd6cbd9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 10076 bytes