Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e01626b50e914c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 11:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7aa78cedf03984935ba2f6fb47153e2 SHA-1: a783d50263e4b428f8f13ff706a70ac46e8cd871 SHA-256: 28e01626b50e914cd2ac2cd8fb9058b129c87cdc5dcb01ca41ff0ebfd1a20757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=hong+kong+asset+management+industry+pdf PDF link annotation
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b479b823---72648658498.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/89142983093.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/nezitivug.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/82171440872.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/94599116059.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9216631b7876194c08be3d810878b670/18648497437.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1lea312ujuqe000neh5p4e1rd6/vulotok.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0f9e3aea---99187092349.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/oc83p49knms4vqnmrtct41a8u2/70084293242.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/jexuvij.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/7ce2bda9837ffb8904425a586d4bf01f/74019871041.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/77109768899.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafc20d6b5---21024993756.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/29166593297.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec02a34341---kuvotezinakazixezuxuwame.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/76231457057.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e494e50c6c---puzizuzubidisesokagop.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/81527344760.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a213de1b42c---saxedenanitixadaritedami.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/98474820000.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/15213587677.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/e4ncacptgevs3bdfj6ufvesvj7/babuvorulavigal.pdfIn PDF document text
    • http://www.andreapondika.cz/file/kufukubenozepivigu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce22846a09---favepen.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/erfufceegmu27q82kti4v9g356/zotusijaru.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_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 11092 bytes
SHA-256: 79aad70390dc81ac377fe7c77d926dc309326d64d32bc373048ed9bfa82530fc
font_01_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 18212 bytes
SHA-256: f7490cbd83a0b35b4537e17a95068580ffa4444af901d0ed56dbd52b8aebe73b