Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c862ca5249f1690…

MALICIOUS

PDF

118.3 KB Created: 2021-09-06 17:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a9bfdacf60d8e7427ae4ccd6a159f09 SHA-1: c2152d41aefd866fb43ba1b6e81324b93b17d745 SHA-256: 8c862ca5249f1690bc6181f01944fdc31c0c890a74badff6b491ec3bb5e82c9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbfece3a9---galonuxameta.pdf In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/j7u139u1kjk3nos07t7hku6qk9/90892126174.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210726_2DC01E127AA6B47B.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/35c6da5911788cf57b1a668f82bc62dc/9506439709.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161245e82a491e---tikagadarewegivovizoxili.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/64604251063.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d0cc68a9---25051807872.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/govesotukatomirulo.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/27547022222.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d3d6392ea227ed5c0c6fc83a51b45c0b/3793618679.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161128430cf557---zuxoxerupekakosuvejujile.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9172d457---dajukin.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/35666889675.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/72056823572.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/78143838556.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e5ba25e3---9192780384.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/5891751390.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b483bda19---pudixipudubupobiza.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80844e262---32207777505.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/798920020.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4cc0cf7b48952b32e0f33e09e42414dc/29287532573.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3335f99b2d---kobuvu.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/dugumadaza.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/dagagaruxitabajonowogutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%85%D8%B5%D8%AD%D9%81+%D9%82%D8%B7%D8%B1+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0001241f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1241F 31484 bytes
SHA-256: f4c7cc560626e7325021f93448086bc340a881d6a4b484c21b988aa52d692549
font_01_sfnt_off00015b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B71 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_02_sfnt_off00016f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F50 23744 bytes
SHA-256: c285eb729d123f7906448ae5263c87f1408caf058964102d7d9dbe6247b47fcb
font_03_sfnt_off0001ac0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC0E 18348 bytes
SHA-256: d597767a5e37bf1f6c1caaacb5a77b9973f4ba442d3b7d921ea43bf0264ba340

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