Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc6de0d45a56fa8…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 14:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c369c69b90abb5f14f83f09ba675c7c7 SHA-1: 285cd48216267925e83722c56fa5516962234fa3 SHA-256: 7dc6de0d45a56fa857bb08c94d2eb71350ad64d93ddb229f07f5ebf7e368305e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve as lures to phishing sites or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=como+pasar+un+archivo+jpg+a+pdf+en+linea PDF link annotation
    • https://abisspaandboutique.com/nbloom/fckuploads/file/zogojuvemowesul.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/nolupasoruj.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210902_DE4BCE7EB9F29CA5.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161346b312ca56---gorugajikovorobotuliwib.pdfIn PDF document text
    • https://harom.ro/files/file/82496260222.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/wuwexazuse.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/25621334199.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/fagobogavedemimafixeba.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/jurazemokiruzowu.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/19927501211.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/48981972263.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/69311460227.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161335f0da786b---33614197541.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/217bd7cf8a72e04b4593a41e40e65f48/41523322589.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/99380211731.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/87892094300.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/275798104.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/zeledajijagawevo.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/20390695757.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16131c875cf636---36016240706.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/duxitojejamenane.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/jaxadagimen.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/kadotezineda.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/xuxonasaz.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b8e870952348d006f4b7161176cfc05b/wibixejalexozuxawige.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_off0000cc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 11296 bytes
SHA-256: dcd9c30c4c9beb2552b50da9e6d2d91652eb5d3787f1d42eab3fdd5a133ab98a
font_01_sfnt_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 18396 bytes
SHA-256: 9291e45f89468e21007932a22156c2288eb50fb9aae231c4d06bbf4490ed3b1c
font_02_sfnt_off000114d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1