Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f9dcb3af01cc5f…

MALICIOUS

PDF

94.2 KB Created: 2021-06-14 07:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b7460a56c9bc8c63af89d85563e1ad98 SHA-1: b7b6f541b08ca2db294fd931dd7878fee0f3efe0 SHA-256: 38f9dcb3af01cc5fbe220ceb8324e8bfa1fc318e24f04adea2303b73e08d1eee
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://irlanc.ru/uplcv?utm_term=justin+bieber+let+me+love+you+download+song PDF link annotation
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/69694713f766f5b4daa4ee0122c2aeb1/wuworumulidebunamatonup.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/16537357321.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8455d896---newededegabedugajiler.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c124ab1b9682ede4dcb44fefae1967ff/88643776070.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087c71ebf772---tetesemas.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba77a03f51f---39234638386.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8bfa452bc5481592661f6b0219f0d1bd/81914050638.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074433998a6c---84578584112.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/3593574562.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/8676714871.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c758d0fb6---65993178085.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/xazetujedadulideril.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/11886489080.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608226046380a---65235295847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012f0a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12F0A 25784 bytes
SHA-256: c7b8bf3ac1a71ab1e6f2fddaa65f99ee62ae5c94959dce3c548a6875287510e1
font_00_sfnt_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 4576 bytes
SHA-256: 2fcd83f4b29ff2b4844be3ddd9e70ba6f86a9c3b41557c52a73ba3b0bcafe356
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 5412 bytes
SHA-256: 6c176c54a784ee1154faa99c073d1bff54d034b4a786e08d814041df31c3fea7
font_02_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 1648 bytes
SHA-256: b3bf58635a6616fd2d8175ab3fbe708eb5bfca77e3127467f16db21786c1078b
font_03_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 11428 bytes
SHA-256: bd15fcc59bd72b90317e845667e21ed3683ecd84803d1a73d464b4c5ca16b677
font_05_sfnt_off00015c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C43 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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