Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73453f11a9b79e5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 02:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2c4874a2e7a969fe53ec6c96180cfec SHA-1: 2157111c220ffcde226ce1e1c8cf84f04536218c SHA-256: f73453f11a9b79e5367e93d8c762e718b9aca673cebb4c951c3a9a08f28d7c10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The document body is unreadable, but the heuristics strongly suggest a malicious intent related to link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://security-m.jp/tool/images/file/rodejagumufowodirim.pdf In PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/53553481752.pdfIn PDF document text
    • https://grancom.by/upload/docs/155805903.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611f958196960---90565405792.pdfIn PDF document text
    • https://coevent.ru/upload/files/95191305266.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/zifuwokaki.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/pasimob.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a803ed90190952a3f31788d8e51d10be/59758927674.pdfIn PDF document text
    • http://mamitobe.ru/files/file/luforajebemapusikinuzur.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/39fade8b583312d8668758434cd55226/89719684670.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d78fbf6c52f78f705d93d7ad1f16336d/wuboratazu.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/4gep6p4820a4q0qcljhdq6chr6/livoresojumij.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/febixosazigagirutigetur.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092c00d4eba4---74801917851.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/doxaninejelejim.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/73895887952.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/lojumul.pdfIn PDF document text
    • http://beateromer.com/bilder/file/bagajusafoxid.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/ravedisepiwijebutiz.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f72f097ad32624214556e5b0c97cea9b/28784969718.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078beaed8b10---75837458865.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130130770bfb---16289578594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=steps+in+hypothesis+testing+statistics+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_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 10940 bytes
SHA-256: f0819ffbe57331075a7a5fc9d084bacfe07df01ea8f9aa296c1268e975450ea3
font_01_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 18052 bytes
SHA-256: 3b022ece950be60621bc2e770b4788f5d89d1d09380bb49e38a1ee615642c352

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