Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3ab6670e435429…

MALICIOUS

PDF

73.1 KB Created: 2021-07-04 22:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0958a0b9e5121be8ea99d5ec46db7e44 SHA-1: 935fe7b5107fd54ee6b6dc2e3d603343691d5b57 SHA-256: 0c3ab6670e435429c959517ee9e518d582aba4e1abc0769d5e07cbccaf452b8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=igcse+biology+paper+5+past+papers PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8145d1d6---37098584773.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c99dfd4353---lopidaxawepu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8113eeb14---gegamajudobakateserasuwab.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/dfefb3261fc80f680756cd7fa5230ec2/zazoj.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/97eba21e760f91df993a695eacb5598a/80436748492.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c098e822d3---zovagemorububunezunilosob.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/sefigowofugifo.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/zozusojowikobunavatojaz.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc2d79568---xopopisuzenigivokujawir.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608687233ddfb---lotivijira.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/luzoturiliraxosokizul.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ca8stoj1vrsnddg4u0fpvcai07/koxebomexewok.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608171c175757---bililinera.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b958baa40---62701696234.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/80285468701.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8e5867e6db1ae5745d2eb13e74825716/27180020862.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/bo3vpdcfrpk1n2h1aslv981d6i/70163407552.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac4b6cf63b---67804434995.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/xunuwojuzepopumusa.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a1600c63f3b51fbcf7185dc1dac0992/83316834399.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/19669780799.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a408364e55---8949201152.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ngujfpjs4m0upcavh7hfep1et4/vafidewa.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_off0000bfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAB 10784 bytes
SHA-256: 965ac7fee8918421de49fe8297698dcc8da4eae484d8a94aca486d7eb530d498
font_01_sfnt_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 15016 bytes
SHA-256: ef8f8e0bee2988ae9be28e8581c6fedca7c4daed9dd00c0c7dfd24b18cc45f56

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