Malicious PDF — malware analysis report

Static analysis result for SHA-256 724813875fc37c47…

MALICIOUS

PDF

80.4 KB Created: 2021-07-26 00:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4e8b3cb0cb25b57db81b179441e3df09 SHA-1: 3faffeaf31833acab152d33fbf49f258a8c2a138 SHA-256: 724813875fc37c47d39008684fb70b03cc74f9fdadfd2be46e6373f91622ecca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious URLs. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbf30e2d5a---46169542800.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a82b480b02d2e65612a8bdd5e9520aad/44421514806.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f901f1058a---dutisoral.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/11919130730.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/moburavidexo.pdfIn PDF document text
    • https://geniodelweb.com/file/3316996199.pdfIn PDF document text
    • https://andrejc.si/files/file/18632324786.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/milidigunedujixefibone.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/1680066948.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/22244905931.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ba923c5ed07---dizix.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a7487f4a3c28f6efe82086b956ecb63b/26075022907.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/81693477304.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/vazimowonufe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a98909f5---8749058591.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105121603333669.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/93624322739.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/xopirefuzuzasifevekilov.pdfIn PDF document text
    • https://inifd.london/uploads/file/3027507882.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/32071922554.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d104b7fdb---7506010722.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62ddc7f1f5---32681254019.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/tavonofike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=como+baixar+musica+do+youtube+com+ssPDF 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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 18216 bytes
SHA-256: 5c643843d46747b7d7a09b05e4c717df77c9dc18b61fd81a4c25cdf1ce43d056
font_01_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 10868 bytes
SHA-256: e6a37e6718cba1b270747ea6735753b59ae35c23013e00c1598df1cbb91798f3
font_02_sfnt_off00011bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1