Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddb41b8ff90ce98…

MALICIOUS

PDF

89.3 KB Created: 2021-08-04 18:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 788fbbb589b26c6fde72ab1cf6385f14 SHA-1: 26ff66f88115e3ec953e83725bc3ab1762971472 SHA-256: 3ddb41b8ff90ce98ba3eb8e1e45f6a1d2f0f240be9b595fdb714a011f5d86f41
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or facilitate further exploitation. The document body is heavily obfuscated and unreadable, suggesting it's not meant for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://allytemp.ru/uplcv?utm_term=jennifer+grout+wikipedia+deutsch PDF link annotation
    • http://asiancfea.org/userfiles/file/24444078418.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160910a1371564---391928473.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/1c247ade29297a65edff5aa4e54d7838/faxegigir.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fd07f10f9c4e33a1b020e7dc2e94cb20/kaxeribe.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/40623477389.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/zedafixuketex.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722bd4e3a9---geralinebofapixupazi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/80kmq5ukms8q9pn9tvfc1h0gv5/bajupevutarekobaz.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2319fa4d37---libime.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/gs3glls9eo4q5cm6ttqhirn9ci/79560301041.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/10ebf8d1384da4065e6fc100d8c96488/netazirapulis.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1f6a46081---pevotoluwigafotizekageso.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5654e4ecd---1047066535.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/65063877629.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c03dcd49272---8862772119.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zitiwafatavuzoneko.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c441c881b56---21425663698.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/30697141443.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6019212f9---xidepati.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/59609565335.pdfIn PDF document text
    • http://goldmustang.com/files/files/81314691348.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de1b56b6a3c---vozupeveseketerizu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jorasowowixewalim.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_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 19904 bytes
SHA-256: ee6fe644824afa17cdcfcf836707ee90df1f547dd4f443b816b0519dfb5432b1
font_01_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D67 11124 bytes
SHA-256: 974345c0be65882091ab69cf95b24445635c986bfc68c8943446293e4e1b344e

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