Malicious PDF — malware analysis report

Static analysis result for SHA-256 5682f542c55fba32…

MALICIOUS

PDF

91.4 KB Created: 2021-07-01 21:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b92d192777988cec294ae4264e2badf3 SHA-1: a63e3aee07c5cac7e5fe715b8813ea6c12ef64fe SHA-256: 5682f542c55fba3299eebd30625edbe8b8ba987c55dae1caca73f9d15eaa3511
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://medvor.ru/uplcv?utm_term=all+luffy+crew+members PDF link annotation
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/g9btm8v683l350ovp5i4lhfro0/kulik.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc96d3539---tuviwosi.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/muvofezenubos.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/347318b6c89f13df1930c2f1edf50d2b/tujujerikofowawekesif.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607788cfdc2a4---14433743670.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/l1c6kaqvvstno6kvgq7jrbfge4/78951729797.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/11200722035.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/54f541079c6f52c2b0cd198009151f6a/89603968916.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4e03d8dd6---tiwutemogezubapelojajeji.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d4164822---tevedawopu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h7itc3iaoeb0bne0b3k99daev7/41766137169.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/sevedomas.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/49445738538.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/solepizidukaleti.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d17b1e47878bc15ba53375fd778c798d/lomevuk.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc9f90907b---fomovupevajolunu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e43a48df8c46e542e5d44cb65e45f92/zukelamuliwebozuvil.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaef9ec1547---11634752262.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503220110626252.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf0aa3e26---41458032579.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fcj5rbfnorbhkko1s0b0inq4s3/nomalirev.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nugagalaxuzalanato.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/sijad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 17704 bytes
SHA-256: d9cc3bcf5c11254703711b2578568c2c491f3f5f3805f83c88744dfbdc98b019
font_01_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFB 2412 bytes
SHA-256: db45d567664de61bafc935320d7d69fe408246c7b998dedc6585bdf3990dcca6
font_03_sfnt_off00014898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14898 10344 bytes
SHA-256: 7b0ead8f5d96ac21e3f9460e5fe88379ff3195883f12f4bf92ab21644913aaa3

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