Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18269c26f6c61d0…

MALICIOUS

PDF

210.9 KB Created: 2021-05-24 00:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 72642fef089705d8b4387f57ea2277f6 SHA-1: bd16e42b620f0e2d7ceb9c63ebdfe656e620ad02 SHA-256: b18269c26f6c61d09e1bd7b2dc352229f0b14bafeb104091de1c6dc243c0302e
166 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 0.9969

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c698b8c1cb---xinajo.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5482ff5b0ef88f4a2b5832208aede064/91874666071.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7ef5o7u2tsgd6e6hb2hte862d4/wiwalodago.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807ba2d949a---68414611646.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160813e81a3b13---getiximolajorexoj.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/25583146318.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/7875746157.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/siwizamebasiwarorixoz.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c19d517c---jejotetebenotolazetutare.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6be7e1d16---wilasulipaduzukerozu.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/57699004022.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/90656427f5ac60dc81d6d97c23e04eb7/39001425971.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4b0493aadb20091045e8b0590e24c39a/bupapuvelanuvaz.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/bomolanamafegirodikob.pdfIn PDF document text
    • https://scriptdd.com/_file/file/44050686558.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/85000735699.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
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=noam+chomsky+language+theory+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F158 5536 bytes
SHA-256: 2a2a06baf879677c51dc90b0d6403c92d982f605c54d402a9f1c4a1f8a5f6268
font_01_sfnt_off00030413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30413 14120 bytes
SHA-256: 14a53304206e58d94126c992b368eeb983d5bc56152a30a0d0af0e00e293f936
font_02_sfnt_off00032fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32FA1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3