Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d07b712f4799a7…

MALICIOUS

PDF

91.2 KB Created: 2021-07-30 06:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0c7982469bebb33664ec8a8af772aac0 SHA-1: 357fc4a0a69ebd9af1b0fc319d510f6cfb7ae1a7 SHA-256: d4d07b712f4799a73487de50add421b4005c22b72ef1e0db1801236b6f2a9c12
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gta+san+andreas+apk+data+apkmirror PDF link annotation
    • http://ctyrkolky-gamax.cz/data/dokumenty/fofisotigima.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102eebf28c52---36244702089.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/donedufusipaketugogof.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fc85cf6df---2455059525.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/308e37gnefv72kthhg8tnrtop3/92861540006.pdfIn PDF document text
    • http://attlas.center/userfiles/file/vazogele.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b12ac0d52---ginedudametina.pdfIn PDF document text
    • https://avela.md/userfiles/file/lokigav.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d4f825c62---dokegozedew.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/pawupawunoxaponanoturux.pdfIn PDF document text
    • http://test888.org/uploads/productsfiles/20210704125202_98cbc.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826353e3118---zewiwajalalexovipe.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd772ef792---kusuzezewemewininet.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d52290a2d2---nupawitokef.pdfIn PDF document text
    • http://seamacros.com/upload/file/daposeluvamabos.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2c0d0b0fec8db2c77b9c1dc1454abc7b/zinexukininuliwaxenipek.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f263140564---4857980231.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070067873a01---37165191423.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/popevezuvinabikireda.pdfIn PDF document text
    • http://yuhongzg.com/d/files/21970118743.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/jokumagadumajizaseger.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/vekorave.pdfIn PDF document text
    • http://apcmagon.com/userfiles/dediwikubisosalegemek.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/92242426655.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_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 18368 bytes
SHA-256: 6766b2bba685c2f8672115a2034dcd63d1223614e69c4f45509b40e33b1a45a0
font_02_sfnt_off000144dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DD 10636 bytes
SHA-256: 7e58262efca3fbdee3c399eba1287f81bc1441c53cbd868c0d08bc7d54199a8a

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