Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d83f5909f1bf9ef…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 02:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 33dd192a42c50cd2f90167ec42406850 SHA-1: fff8715ef81162631abba1c972fa597bcc41a695 SHA-256: 2d83f5909f1bf9ef7e8d04d03f95a12ebb8b17f08d55dcefebe46f5c9c0c5049
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://chokmanee.com/userfiles/file/pumusonagudir.pdf In PDF document text
    • http://www.addvanceo.info/userfiles/files/59454654094.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccbjjro104g57r2lg9obi6rpal/31288788276.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/jawazusofutokamow.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/13590eef5e1f7210dd20e96d1a9f8706/42393442534.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a181ec0d---bowawejojujogetonotew.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/foparow.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/dapodaresile.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac76a7df18d---50970052514.pdfIn PDF document text
    • https://securitydm.com/slicice/file/desusexemokimusadapeg.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/50515010806.pdfIn PDF document text
    • https://siroyensao.com/upload/files/sugimufipofunavozajube.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210812034149699.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/jepubu.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82d13393a---buzejimabepetisub.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/c3c82eb3b6bcdeb0ff20d27fa890dcdc/18824461974.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/92299259990.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/70112517804.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6bab8f3e78bdfc96c1e337acbf360cf2/vopiluzenagowupekife.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/53792450483.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/mubujoxoxuvu.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/89723899087.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/67497477113.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/39d7ntqodoro1a5ffb192kc910/fimitubebenozi.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/laxulukadobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=linux+administration+handbook+pdf+downloadPDF 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_off0000cb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB32 11108 bytes
SHA-256: b7b3e087db843dbd592f5ada70ffed3dcdc9282e4b61a8e1144dbbd6de4ee05f
font_01_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 19608 bytes
SHA-256: c8bd38f95e64ea43fde6ef969476623b998c13cccc9d4b6e87530afbf60cf1ad
font_02_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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