Malicious PDF — malware analysis report

Static analysis result for SHA-256 55614ce0f9e87029…

MALICIOUS

PDF

84.1 KB Created: 2021-08-11 07:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6c1ae6f8cc49b65fdc7619cb58829c6d SHA-1: ae7ffd9b4b4b6595f53c9dab9b2b654359c1f6e8 SHA-256: 55614ce0f9e870296416b0b82516176e1af7480812305705dfb72e70e9d2e6d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress upload directories, suggest a link farm designed to redirect users to malicious content. The presence of external URI and link farm indicators points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=pokemon+all+series+download PDF link annotation
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c20da5af3---tipapijozejuvidewoba.pdfIn PDF document text
    • http://schokobrunnen.com/idata/44268922697.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/fonenijajorasigifakew.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/fokupogerukenobazuduje.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/20971430753.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/nagubarumub.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160770f10a6bd2---9297391820.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e8ba22f6---27620910849.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/11179574220.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/tazejedikobixujetetexu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/9071521738.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2102c682b---24139712983.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1fc3e8eb0---wiwodowubogojutoxo.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/fesereboxalokevo.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/72122940239.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/21407033215.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075810cbc2e4---girixebagoxodidudut.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b412b472627---26014661604.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5039fd3300e46a0de0817ff83e804103/tidakuf.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/lovivuvosajeregilunez.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0e106b93b119997acb5d90e17c90fb01/7459164603.pdfIn PDF document text
    • http://splogservice.ru/content/file/52213002309.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/16912486743.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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 10488 bytes
SHA-256: e452700bcb93e6c000505c982239e2cfe79a1a22d074540ea6b52fb88667d964
font_01_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 17760 bytes
SHA-256: 8b96224f65b64343407a29e315153546fb785303175123630183b41b249a47bb