Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d35e2b09c7ca235…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 09:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5a320ae2c88e5517733272d3ab6469d SHA-1: 1e680cb8cd628bba57d98dcaa2ca340682ed7544 SHA-256: 6d35e2b09c7ca235fe4bc0ee064fb15df9bd2479a9b54072c0e968fb661181f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The primary attack pattern involves luring users to these sites, which likely serve phishing content or further malware. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=is+26+a+prime+number+or+a+composite+number PDF link annotation
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/ginuzuwajinomizedusuzod.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091304180487.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139107f2c351---74099747220.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/04f05d58017e9763231bcfd557d9f563/dejezozetawekabevinijopo.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/197082011.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/60658602537.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/add208db7f7452a126eb3744703fd031/56433425897.pdfIn PDF document text
    • http://maksimetall.ru/files/rusujuf.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/65072964486.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/70166804716.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/85387572317.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/pamoritofawemesixolabuw.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/46720c57f33ed3e2bcf4ccb3b07e2506/53779875930.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/xexano.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/kijobatapul.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/6457324231.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vokizeme.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/wepogoxopalogelega.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/manilupitoturufejemukag.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/ferowumokabulileruge.pdfIn PDF document text
    • http://cbstav.cz/file/24536116190.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-8/20210908015728940586.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/7162401586.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_off0000baeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEB 10968 bytes
SHA-256: bf98f2b7e7b7fc4001c706979d1fb91e2879081c9ba8f0b7c938413d03a31757
font_01_sfnt_off0000d435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 17100 bytes
SHA-256: 0f6285d1ca568d7085564f8e2736a4becd8ff4583526b1e6d220cbb8ea645c67
font_02_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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