Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51e780a383e5a24…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 21:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8994cc2705e0f4afc3bcf0ba92f093c SHA-1: 86f1bb133984c4435b2e6893f80c14c5dc7f4631 SHA-256: f51e780a383e5a24a3e5cffb673bb56cb683bfad8fea1f7bf95335dd87f9a617
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms points to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://garglob.ru/uplcv?utm_term=connectives+worksheets+grade+6 PDF link annotation
    • http://gyndoktors.de/ckfinder/userfiles/files/sagogebaj.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/81920936726.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160818813a993b---72869765006.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/23879905216.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160809ca9a19ed---95090605654.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16115756a281ad---sugitatuwozaxiv.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062818582473499.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/worelisiponi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16100b63a8d067---posapavisivurijada.pdfIn PDF document text
    • http://chayka-svg.ru/files/walelaferewi.pdfIn PDF document text
    • http://hueide.com/upload/files/6063778238.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/zirar.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/15993502984.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610cf4564ada7---fapedubovu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9deb9aebc9da3fa6ba1aea5d3035eeda/tuxuvaripebarapamok.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/42177262815.pdfIn PDF document text
    • http://atek-ent.com/upload/file/lowonixako.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/13508365759.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a6fa538024---toloxivolariba.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853f454006b---tirolepem.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/borufogusofu.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/bipufojozigog.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/rudidajogirozuwerogusis.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093be707d087---jisigo.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612109626c219---poxikikibijutivuxuriti.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1c326a7e4980e356731065b8e3aaa072/53608848273.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/rijimikozup.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_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 18872 bytes
SHA-256: 5ff9dfca16548269ff47633b6b2562d2d37527ce2af4ff2faa5b1d37834da209
font_01_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C57 11044 bytes
SHA-256: 0b3e216df33be186eef079743a950b8aa0dd430584ad261d93b528658f9b8461

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