Malicious PDF — malware analysis report

Static analysis result for SHA-256 988408367c63285c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 00:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3b1d7efd0550670cac413daef1792f2 SHA-1: d537e3c0f9251be2cf0848854daf9361c07dd72d SHA-256: 988408367c63285cf624feab8c563ca158930270acfc4defb1d81149751a54d9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, which is a common tactic for phishing or malware distribution. The presence of numerous embedded URLs supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://deepex.hu/hirek/files/vusujirivevawebimifevuva.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613524832332f---52430092644.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021951256445281.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7fed4152---palerojobonanazodisixu.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/13907958374.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/89976346665.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/11060376498.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210914050609_nfkyb4.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/45603246118.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5481dc0136e928ba104d7f8e1f6d2e0f/dawedanutuku.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/lemigebabovopuv.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/16271002116.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/19862572299.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/jnv650diekom3mpv9ef3opuvsc/1437072947.pdfIn PDF document text
    • http://furniture83.com/upload/files/60034596763.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/zonakagotamajarilujax.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/rodiwivowakapor.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/vakobuwezelad.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/xijaparibomeketurorevaz.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/70595275209.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/91769593724.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139937bca776---maxugikif.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/93487835870.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/rukitasodufogelaj.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/94843729412.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/12224176286.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613389921f5e2---59726195088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gi+joe+ninja+charactersPDF 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_off0000d001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 18996 bytes
SHA-256: 68cba4408f38e9a79e4c72b03deb7a472adafdd594b9cf3f7e016e63bebd58dc
font_01_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 10452 bytes
SHA-256: bf5ed33812693d8b16682da265d874bb4a5b57f0de7463906d6e7a045c99a41d
font_02_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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