Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e6b5c21ff5d7d9…

MALICIOUS

PDF

83.5 KB Created: 2021-06-28 01:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: feb266b281ef6b5571cd116e748cca27 SHA-1: 1e24f625f8266d12447a6cf6a6c1f9668a76a3bb SHA-256: 85e6b5c21ff5d7d9923c63452af75e2533a67765664556c457bf39eb85e949c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs are the primary indicators of malicious intent, likely serving as redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=subject+and+object+of+the+sentence PDF link annotation
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078793e007b5---1595946585.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/kagazop.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57ec9d14f---vamisedimob.pdfIn PDF document text
    • http://hotstamping.pl/files/file/murogav.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bd470afb8---70830221560.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7989c0e77e44fbf0d6dc5ea32fed1cad/gozuwegirim.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea458fdf0---64028548025.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b2fab7b5f10e2180148be28b3821f2f4/11570235112.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/e5c754cace4eb557bdb68c7e9d7bb48c/39187246615.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/81026506254.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92359ae09---89679994577.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/ribiwut.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/13038857138.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078872faa581---11889669413.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/62759836574.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ac21c87f5fa1bdaa345dae3aaa5025a6/50234693412.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c04fa84f38e887b52da2bda17d685a48/61328249445.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6379aca8bd---28112578864.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608102c6a04a6---pefotazukijum.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6b12bdc93fbe689d1fef04a6a1d37104/28694807314.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/tivamumafodupoxuzavumobek.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/dunav.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/dowipebekamoda.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608db30e1f888---49412604740.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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 16888 bytes
SHA-256: 456aa0f538fdc07a95fd07d2c8b3b7e7f089630588b85c89e2610960847bd1ad
font_01_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F6 10780 bytes
SHA-256: 41ee0d34b558af707e9bc7ab5ac0731bf90cc7acc75c2869740eff7e0e474cbc

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