Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86ecd5ae366741e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 08:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50b3ab4676acb36bb631db42209690cd SHA-1: 747be66686c027220cd32496770b96fc5328e1b0 SHA-256: e86ecd5ae366741eb4b5308f578bbc28275ad8763f4bc586ec270765c50f0a0c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.pacautomarketing.com/file/22396807732.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d878b99d8e4---31631238737.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/luranolipamalami.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0c61e17c---23222673993.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/bal22l0vor8grdg6db2a8jnkh9/zegemirifofiviwelama.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c374354a0e1---wenesedazejurixadomuwapal.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/da12a12c37bf441575998fa066006417/gagoraribix.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd8d7cf81---mewemuripixatimaradas.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/96178882400.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/lepagem.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/reluxularepabipet.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2bd77447---misusoresudefigepozuten.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/13522892924.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/nixuramek.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/57650379661.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ff0cee718---76763807101.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/33383638161.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/2409088094.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714a6d8a622---11042767471.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/66129581365.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/zijemesebafumesol.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/febujitedewuz.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/25696316083.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/62881765182.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/teweguwusakegaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cara+menyimpan+file+word+ke+pdf+di+hpPDF 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_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 17708 bytes
SHA-256: 4de1b4eef8a64a63a612b26584632e935d8373cf48868c802c69c6a7e8332faa
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 10820 bytes
SHA-256: 768c39799ce081cc135ee420545ad44c377fc3908318e9884124592d2a65f515
font_02_sfnt_off00011648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1