Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb80263063c523b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 04:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 567cf601341360865fca1104ac68d2a3 SHA-1: eb2c93b3a14a0eeb9c703d95544c1729fb25a8f5 SHA-256: 4eb80263063c523b6f358c68d26316f2789570814a3d1ad199d606f2335ee022
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to host malicious content or redirect users to phishing sites. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/aced26be082487f81fc8368a1c5858cb/1508294227.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0278a550---27894304428.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/53362281213.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/16230e7047977ff6d86c8bb15fca63ce/wekesugarinupudolov.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608041447d547---puligabopujirilubujupine.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b76360656e6e36491d7c3eb81b59c537/fetijopogidu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8aae6139---92618828536.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17535d925b---13783873119.pdfIn PDF document text
    • http://didula.com/img/file/23901639684.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/nivizazarod.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/gufumawijo.pdfIn PDF document text
    • https://egf.tw/test2/images/file/77386033017.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/71103037882.pdfIn PDF document text
    • http://4darchitecture.org/img/all/jirajuzal.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/rq06a2ad16p1h0qim0sfs7f89b/lolosafukunoxe.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/joganeretazomadawofa.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/mokifazu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f29d32b0a55---womatinotalekugilinaf.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/56283823875.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/worokofumevan.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/63f53e93ce0d38034c03cfff55cc976a/35753034629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=summary+of+extremely+loud+and+incredibly+closePDF 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_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 11168 bytes
SHA-256: 3b6cce0f18ea1102e7b2afe730ec17bd2156747039656c3879d894010adefadc
font_02_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 17592 bytes
SHA-256: 6fc6b98123e72a8a2d5750300a911e7b5376fb45f1e2d79584503352d274922e

Open this report in the interactive analyzer, or submit your own file for analysis.