Malicious PDF — malware analysis report

Static analysis result for SHA-256 6083d3544cf5b193…

MALICIOUS

PDF

153.2 KB Created: 2021-07-04 03:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f602bfe4c142c501dfc3076c0a8d0b37 SHA-1: b9fc5fc7c58a0886e7fd8a893a29765de49f05d3 SHA-256: 6083d3544cf5b193ee09d6fd88304cbd0fde23fc55848c65344f2634931d55ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a phishing lure, specifically by providing instructions for a password-protected archive. This technique is often used to evade gateway security scanning. The presence of multiple URLs pointing to potentially compromised WordPress sites and the ML classifier's high confidence score further support this assessment. No scripts were extracted, but the overall structure suggests a malicious intent to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcd7bf01cb3191051d19472d07635d81/gedevolineku.pdf In PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5d6ea82120239cdefd06d9ebc5e4baff/rokijumowojilof.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/wupoteb.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/95847661064.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/vivoju.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fg7dpibt0ghbb7id31js5r0ed2/suxubiwo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/836819dc3f06cdb10665420b2c9f918b/duvekanafokidi.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/37c597b4e5461139dfe850f39d3e9e98/lufoze.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a66fc84e9---jukafudatexolomixaruw.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/12751802537.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870166c9644---jozirefozubebolixijo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dc26205fb999dea4c81f430d6b9907a/14967501802.pdfIn PDF document text
    • http://cosyromania.com/media/file/36498603260.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/76386453144.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64cbc3d16---pukit.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/52686511439.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1f4e78d3333d47e03593292287f6d365/nebujodivivagi.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/7l6d5rrfju4aim2ehur4kccim0/99659477185.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4236d187---45066182312.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/800f5b9d34d6e03487c374868e427a17/kasizosom.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfdb35b428---54489489103.pdfIn PDF document text
    • http://rld-carbon.ru/file/tifuzaboxilodulamupik.pdfIn PDF document text
    • http://ropesadventure.com/d/files/papozuroriro.pdfIn PDF document text
    • http://����������������������.����/m/feedback/view/Kosciuszkonational-park-map-pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sargent+florence+theory+of+industrial+location+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://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_off0001e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC43 24144 bytes
SHA-256: 6c78e8a808e96f6a98ee26025385e07af0015e2ba1bce0c7c148724cad00f168
font_02_sfnt_off00023adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23ADF 11188 bytes
SHA-256: 7aefb788a6eb1545f95d90e60767aac897f5e72b81571e9f8535fe0635e0a32a

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