Malicious PDF — malware analysis report

Static analysis result for SHA-256 91036b71e1dd823c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 16:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c893186eca63a90c04e441dbcef8260b SHA-1: 87c4e8114d946329af5d93c52a7efff54ca32d50 SHA-256: 91036b71e1dd823c4a303fdad14b95d5ef83243d30c38b94a9931f79df86b598
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are flagged as potentially compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a PDF-based downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mangmalungtea.com/userfiles/file/44029010612.pdf In PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/7713975874.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7f9e2fd37f61defe7316408e299356cf/xajugikupogawuvovofuvob.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021060921553819.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/gonepim.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/fodupuketuwixiji.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/46852555356.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/91273192412.pdfIn PDF document text
    • http://peak-experience-japan.com/62751523416.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/84236936808.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b999fa4070---37213649114.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/75157729586.pdfIn PDF document text
    • http://drtamerturan.com/file/gulupipaxarivukefeka.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/25176927204.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/bajaduxajorisovuroz.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/mamarola.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdc0a0046c---dofabagetelofasetitixaf.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/jupivawulawomewep.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107cd23931e4---labedotaropol.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/37069141183.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/30648052598.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/piseforepugeditabemolix.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/43067651426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=navisworks+2017+tutorial+pdfPDF 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_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 17204 bytes
SHA-256: b7be0dad884ba8ba9d9ab3225e3b6255646c0d653c970385cd8da2905eef5423
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 10920 bytes
SHA-256: c0fd6f0992b31dba579db5c999e91f6ecf44202e2fa6a58d0f488a5004ff1988
font_02_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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