Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4be0eb7874c759…

MALICIOUS

PDF

76.8 KB Created: 2021-07-03 18:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00a11a4f9c51348c16c11705cfc7c322 SHA-1: 042283e694172d9777d57a78a757dc50f00f0133 SHA-256: 5c4be0eb7874c75967ceb26328ca8bd72db4d5cccbebc48034d539170e2dd1a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The file contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of these links and the overall structure indicate an attempt to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://queure.ru/uplcv?utm_term=mittens+for+hand+spa
    • https://mavibusiness.it/file/zemipozerusajusofexoman.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16096791c24697---67346870052.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607171adc6376---90445502820.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/7qrginrfq8b2rnk4arsqdeseu5/xikadebalakaxemex.pdf
    • http://studiorinaldibedin.eu/userfiles/files/wexoxokilotaxumopiw.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f1ae962ab4a2df020af19564d9732679/87327150605.pdf
    • http://unipsyclinic.com/userfiles/file/20210513185422.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9777821df2d03998b521008e895763b5/mebinavapefiniwaligidugo.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e4208923ac255faa13d8d2fc8d1e8bdc/47927610275.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2a72933699a9faf16c0e45b2975ad42e/10742450823.pdf
    • https://partnyor.az/userfiles/file/95880314737.pdf
    • http://afghansolar.com/userfiles/file/dexebewuf.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c07e81598---rasezulum.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16085767d46e6d---dagumelorewura.pdf
    • https://standardpromotion.com/images/upload/userfiles/files/foribezaz.pdf
    • http://bjsprt.com/uploadfile/file///2021052501570919.pdf
    • http://iziusb.com/userfiles//file/29629178226.pdf
    • http://10glazsikeyrosa.ru/file/worutizobimomafofimun.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205854b182---dokivewenubuxa.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/nulofamukapotos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c57c.bin
4c4a8b9bc2a79d476f940208bccb472c8f715697ec71ecf80df92369485de10a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 10540 bytes
font_01_sfnt_off0000dd6a.bin
073f03874ac942f5b5474af6d36b2548c68ffed48f81888e69abdba05f40d6df
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 18968 bytes
font_02_sfnt_off00010e68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 16792 bytes