Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba73cf7fca6d1ca…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 22:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 604c41f0e75498396de524a4664014bc SHA-1: 255f3e0b7263b3af5d5b5214881efbc41bf3f077 SHA-256: 6ba73cf7fca6d1cad76145a95188690429a417df370e77af11d4ef0ee6cb19b0
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. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and disposable domains, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links suggests an attempt to redirect the user to a malicious site, potentially exploiting a PDF vulnerability or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=word+to+pdf+multiple+documents PDF link annotation
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/91d0a4beb3ee8da88807c1ab8081a805/wimulumabapolibapaworuke.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f786c988---87971347014.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/fetupoku.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/53225805610.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e85cb56d---93011755838.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/75b418e1c0fa6191698e45892e0e25dc/47307844164.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/4561788302.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609153ef18341---71607986002.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/26834660706.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/zomekorijuvogetibes.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/topasegiligajudug.pdfIn PDF document text
    • http://millecolori.it/images/file/verezup.pdfIn PDF document text
    • http://stevis.cz/files/file/jokiku.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/140f6f97c41babef6185b54be8647d6f/poriwegarabewudug.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/feramabexipikezufut.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076cef6457a9---wosimanowetigoroji.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wabopades.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/43214007ec62502c16cad1cc99cedd0f/18118885225.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9d01a8544---zimoxakopigemafomurejis.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/pu7mtvkc9g9r75tairvhr03i7e/92071783267.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/mumuxatizanomapoxaxa.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/850n8qj22i637ct8remfon8td9/33517998183.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/35919545175.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b4dabc45---wizegufajinenab.pdfIn PDF document text
    • http://kasargod.net/uploads/file/38365584733.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_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 16856 bytes
SHA-256: 434168ae7cb2eedb98ca6afd6855e2f1be58cb300f3237e8d7d560226799253b
font_01_sfnt_off00011856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 10712 bytes
SHA-256: ddd6a6df161e2df986a6f3abaaad9a5518bb8a8c4c7e468158dbdb1f833b4bf7
font_02_sfnt_off000130ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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