Malicious PDF — malware analysis report

Static analysis result for SHA-256 c555c57819b5bc37…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 23:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9228f0a43806feaafd373189f9afa093 SHA-1: 4d2fd4c219272628e2653f1825c06fbdbc554ae5 SHA-256: c555c57819b5bc37ef1d3d640d1d2111859a38c0d842866c889a6747f250b7f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous external websites, many of which are hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable due to encoding issues, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://questyme.com/userfiles/file/25543229770.pdf In PDF document text
    • http://alhouti.com/userfiles/file/9037494310.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/35137497073.pdfIn PDF document text
    • http://ndt-ultratech.com/files/6130672811.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/96019450730.pdfIn PDF document text
    • http://canadanur.com/resimler/files/80548150355.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5d684fa33---vumibelugabamibiser.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/57676446262.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/450e7bd9d02853c09b5ae49797acff8b/88494877905.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/fevevixemozipulu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0047ebb629360ada2c1e0960ae9e7f73/febifidakavavogeb.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/lutenolomenedaxi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/5e6glo1ioqi5h00ednbtm5aaro/xemanadiju.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7f7a601c01b62246431098112e825c92/42743123726.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/51606110667.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0b6308c50ba0e8d1b32404ee92abfa01/fowexesorepuzutukit.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/65ab8ccbcc2c5f82f39325d41f72dc69/21270272226.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/20e7ad395f7c8e3dce67b6c6b052cfc6/93578011677.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/10373242940.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5a1026b0---bozolizuvovakuko.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/xofagufi.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/08417179cc1e1f67f3b3e7bdb1dac5e8/digekumepigakigeduf.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e1f48731eb2ccf91dbbc9f02c0d27403/zuxodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=kings+canyon+national+park+to+sequoia+national+parkPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/04947ba8d8792790c3b21e8c7043d8fc/91297490982.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_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 16332 bytes
SHA-256: bd21c611de845f1e25c88103d8a2e7b3ae0050b2bbd1bd5b210a02c346c8bd80
font_01_sfnt_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 10992 bytes
SHA-256: b070d105bc9fe247770396142b29a738201d5a5e435212f5bb52b49aa484a540
font_02_sfnt_off000140a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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