Malicious PDF — malware analysis report

Static analysis result for SHA-256 859f21d07fe63c92…

MALICIOUS

PDF

76.8 KB Created: 2021-07-01 18:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a1f218332e5bbe38c35a2250a5b47353 SHA-1: 69e212eec5b6ece8e09df67328cdf39f6180dc6d SHA-256: 859f21d07fe63c92adae19d2330e3e4506f1160d08fdd931be8de1fb311ba1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to manipulate search engine results or host phishing content, aligning with common tactics for distributing malware or conducting scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/75681700080.pdf In PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/78433673870.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/22239078384.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/16259921560.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a2e402a691822f71ccc0105514e42c98/35419110689.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9b4a64881fead521b2143714ca838c97/dejoj.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/25f96788e93d60c3fc143a2aeede374c/tomagitenovubugosuweka.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/94126c8347b8241fa083330b2e34248e/junure.pdfIn PDF document text
    • http://planetamama.ru/files/file/51359662386.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061812502373499.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/3cb005ae98a9e9871a5c19d7f8902d63/28982828481.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2lffihd2uke7b6gpaomkla3ng4/87097231006.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11f39e531e---puxogilo.pdfIn PDF document text
    • https://caffedisanto.it/file/gewetonifunezimasovujoted.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/nupunuvodexot.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0e445245---53905512.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf459a67d1b---nofuxatem.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/sufajunelidago.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1c5c49853cd6410949d49783fd65a878/35030139606.pdfIn PDF document text
    • https://kede.org/userfiles/file/zoduxetoledepizilunokor.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/93268949128.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607307b6aaab7---zifudijujupuliwafikum.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/1bb6a0553eca0518a96616e6cbb9c75f/15814471005.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/35508460282.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/52779627179.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ua92889pbkeb1k33m9fo0d6uba/rulixidufojusogetili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=concerto+for+trumpet+and+orchestraPDF 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_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 10876 bytes
SHA-256: c757675286674ae278f27c8701a21b948d71f2a1b7a8f2a801e69538121e596d
font_01_sfnt_off0000e244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 16108 bytes
SHA-256: a676325d2b7859d2604bbc1eb3e9b00d5c8600ff530c115cdab1e8e7b121a5bd
font_02_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1