Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9840d4c44dc5c1…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 05:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64d3f5d317070353a651db96eb7c3932 SHA-1: 6ce1122e62e9f7f94e41528993b9787913b1663d SHA-256: fc9840d4c44dc5c101f19a0042b0835a48dae1057700aafdf3b09eef73c914cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The document embeds a large number of external URIs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to phishing sites or download further malware. The primary attack pattern involves leveraging these links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=pes+19+download+apk PDF link annotation
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a12429e4ebf645b280d2c9b602931340/44623008205.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210923_084521.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/gekojolisalogubiroge.pdfIn PDF document text
    • http://sireny.net/share/files/fuwuzun.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/bevidinefade.pdfIn PDF document text
    • http://besteva.com/upload/files/gevavidomovezoxixat.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/dodigokus.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///48976154768.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/98798204633.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/16536908849.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/51880851281.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/tubelafixezunixonos.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/56657654587.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b670430e7d---41975140872.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/g7h2h9ctgnfp90fr9bi64r776i/98507248084.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/nanowenus.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/bujalomanamu.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/jonekevivurudigaxubokaban.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/76566536218.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210912132206666994hahkl.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/gukugexixupivizabisu.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/11192386622.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210901162557.pdfIn PDF document text
    • http://eternaseguros.net/files/files/mapozimetatatuvaf.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_off0000afc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 10492 bytes
SHA-256: 22c73e22282b4c24de2beb34c7269ea35249a0a524a9c95c7d33d246aaa30a20
font_02_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 16124 bytes
SHA-256: 71bb341379bd6a84d6f00082a343ca01a8a1511ffff5d4324e9320886b32bc32

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