Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc5a2293fb81ba2…

MALICIOUS

PDF

86.9 KB Created: 2021-08-19 19:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8bdf9f0ad6a10b536bf14f4bb9b6436 SHA-1: 29751b0d1960b940210460a0dc5931455e3cee14 SHA-256: 8cc5a2293fb81ba28f63997270dc4b4951b3b7a9ffcca8bb030bae61735f1064
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, 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 document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://srmhospitalities.com/images/bulk_images/files/kagig.pdf In PDF document text
    • http://polesprogettazioni.com/userfiles/files/96244936278.pdfIn PDF document text
    • http://huntland.hu/upload/file/41465609889.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/nr713d9ivuoldnja8f6s4dk31a/fudagufesigosikat.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073272b0966f---nixulexip.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608688593b596---rajonabirukirur.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/nakiteganutet.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/91095371490.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/zunodedibetotazazunasol.pdfIn PDF document text
    • https://magatek.com/documents/file/zavuzuxotilosolakuz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd03e0b32a---vegimalarimeb.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/37627128681.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c49787e2a---pezijewojezekukejudilemek.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/simuburufojo.pdfIn PDF document text
    • http://asustainable.com/global/file/91978784697.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/34240864945.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/12134294323.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/24379789207.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210715235908.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa5a662c4---91844163385.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3d88c778---24489999428.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad13b3861---15486525927.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/77225121421.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/febewewu.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/razuwunuvemigizuwome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+type+infinity+symbol+on+chromebookPDF 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_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 11008 bytes
SHA-256: f86855181878e5f69d96c2884834238042de849ddd3976a76303ff49fc50450c
font_01_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 21220 bytes
SHA-256: 5e6c0b828de3723357871b0d2daea43bad9a7c044b4319d5633104634fc1a315
font_02_sfnt_off00013319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1