Malicious PDF — malware analysis report

Static analysis result for SHA-256 101b36f376bc1bde…

MALICIOUS

PDF

73.1 KB Created: 2021-09-02 16:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: feb0a5c069f514da6148cc3216192420 SHA-1: 9b292096a66e3185f9d7adc2104bc71e49686e67 SHA-256: 101b36f376bc1bdebada7a439c9c8b934684e5747493e75fecfcc6e5426459b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://theleadershipworks.com/PO2/UPFILE/userfiles/files/tezixidamo.pdf In PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/jabafivul.pdfIn PDF document text
    • https://panama4d.com/contents//files/13342013618.pdfIn PDF document text
    • https://majubesar.info/contents//files/40496317686.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/668eb302ceda0f420c7b371e5b8aad54/resupugibalupadav.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084809fcda0a---19061990843.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e443fa9178a---sixazowavemoni.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/39d6cae0913ba3e37635a934a3674896/61439312928.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/87225196026.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4eac1e4824f8ba0ca8f826b49747d66f/78182486082.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/gezoj.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/59117332081.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/69544249918.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/75515421389.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a36dc853a---nokerubinegozagu.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/72420571770.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/kewelojagapisutiguzo.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/lawoxikoz.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108f9705284d---34269647446.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/6340166639.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/mogekin.pdfIn PDF document text
    • http://omni-links.com/64966196812.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607010122f74f---4331339260.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/34523835549.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/rodokiwafinop.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2addd264f---nukusewewito.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/38559210548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fatty+acid+synthesis+steps+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_off0000be53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE53 15744 bytes
SHA-256: ce3832cfbb178e7788d2611e063131e8d6fc4d027615f6a1d34dfcbb09c28336
font_01_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 10540 bytes
SHA-256: 2bb0b7f92c20319570d6a10bb0b6f8c5eb78745787cef35e92ea3028987c887f

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