Malicious PDF — malware analysis report

Static analysis result for SHA-256 53affc3317496c56…

MALICIOUS

PDF

90.0 KB Created: 2021-07-30 00:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 068e0e0e3b689d896239b446bb50a67c SHA-1: a15b2ab2211b51df502b3d617622376dbacbc670 SHA-256: 53affc3317496c56aa88437abe7dea60c1bbb19f25d3adaf629b7a03a1634677
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=a+streetcar+named+desire+stella+and+stanley PDF link annotation
    • http://bandenplaats.nl/cmsimages/file/ruruboduf.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/45133246851.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc9db0af9---saragujosebevisekodinap.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb19347886---65430357776.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/44953362053.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bv5va4kijl6t3inrhfoj1ukc07/kabowazab.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa77adad9---29159783739.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3065da822e---46455835170.pdfIn PDF document text
    • http://abpaluso.com/upload/file/xopexonidutogajetokugu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753e2f08105---farutipisidixozako.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089a7dc10a8e---pimipoxajivetakizovufe.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/pajirepo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae607af72---wusazifefafalosatiranowu.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210507132711.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c40e8e7e06---vubosogokepemomotexiv.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17bb1fd25---15022356211.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e09bea876b8228ca198c2471d5dbe10a/53291774155.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/g08grivodjlnea005fdvs6scf4/53526036500.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/likovaruni.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/dab1bba937899ff68e0ae6497407a884/80115146954.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210730020202.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a4de893d---xajunalezenuvuno.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_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 19004 bytes
SHA-256: 416ee17254d88248d31215b574dad7261ce5b4c271c261ce1666c3b56efd0282
font_02_sfnt_off0001403c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403C 10504 bytes
SHA-256: 8622c04a850f8a93bdcb1bb634a252486a8108f3a9f1950f6403fcf5b9a4e481

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