Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34740303f96e2aa…

MALICIOUS

PDF

88.8 KB Created: 2021-07-05 06:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 341a062aa68ab7bd2ff0738f41718551 SHA-1: 6cdf99a9e1037bbf291994ab9b064b3b5779d2ad SHA-256: a34740303f96e2aa8f657791411f9c44d34e3645e067f66195208a7cf5db4007
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=we+are+brothers+and+sisters+in+christ+bible+verse PDF link annotation
    • https://subarini.ro/mm/file/19818638611.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c3af0e9a---putizixamozebuvofa.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160973938ee9ad---31875545212.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/zesumixo.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/a9943f662a8e2516edc75583310fd4e9/sabowatopulaniki.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/bikaxuririrudupimamito.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a1e59e339---tonijokekuvowuposabe.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/79j6jadlrpade0hcracj9ccmq8/30821240601.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/35947185568.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fb36ae4e---15708861901.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/58490947395.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad74a74c17d---govumewij.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099e59f743c3---41842592254.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/84845652938.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1d7f742af---dumulogabujikul.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/6207814599.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8009ek4m97q1iijfmv4bqf7nud/kujeluligebizoxusajetoren.pdfIn PDF document text
    • https://tmtteks.com/files/31548241802.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/gexekorozareketiv.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/55334500693.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/a4c956cbda4327336fc87b3fd3b32459/visuzakog.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607169299a173---60388519173.pdfIn PDF document text
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/talenanuzodu.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/3224788198.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_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 10664 bytes
SHA-256: 1132e06e1775bb246b37d0f4ecf335ae85f71a5ee2844c761b5daa04e32415e3
font_02_sfnt_off0001297e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297E 17088 bytes
SHA-256: 99c3b64413e8c0c1816b2ef5a226dd2da77991634efd85d407f49b7d2b1badea