Malicious PDF — malware analysis report

Static analysis result for SHA-256 debad56764b9acbc…

MALICIOUS

PDF

97.0 KB Created: 2021-07-03 21:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6386393b6ebfdf93ba34636fa043cc8e SHA-1: 5fe9acf31f0364512c26526443a312c830a35cf2 SHA-256: debad56764b9acbc0f5dd2ef5e9ddf94212d5d6d76915aed2dce44145d555bec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://aimhc.com/userfiles/file/98378369196.pdf In PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842a3bc6b0---fojajeseguzivelonizefov.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/gawonivavimewu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1f5f5c6e4fad95d3d7851d25c8ec5d70/8022700481.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/80c159370f63b9479c1226b9f9c8098d/guget.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/070719227686.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/33309234163.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/dupogep.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/suhqh9e2vg8a4vll72e7m0aci6/divudasoxupogozexefobanu.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5479v67q7hqpgrclpurpl599di/kavikedusepikodugiwezi.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/tguqvsasoauegqdnlkg2qmrbgu/44131787768.pdfIn PDF document text
    • http://kfbi.ru/content/file/27829104874.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/5e8ea4b001e2059ea299f4fc61de3cd6/28854920921.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e42cdbfaa---vadedanimirote.pdfIn PDF document text
    • https://abeess.com/userfiles/file/rufubota.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a8868eace33---xebasiwofosa.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa698e5c2e---dumofolaniduxomuvozomal.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/6742367229.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bgc3rvrptvf364m08rjlfci03u/zagodatuxatuwuka.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/232rvdiecmpfn6ls6ljjvhnvi0/jumetawokujukexutovevo.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/53239989862.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b317dfec3fb---50185688277.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-1/20210601215612557242.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/61293583516.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/ligaraf.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/60496878152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=converting+auto+locking+hubs+to+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001143b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 18116 bytes
SHA-256: 4e0f6c8d1f3964a6ba956417708e62171dc83b0f21817e9889e214882ea318f3
font_02_sfnt_off000143bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BD 11108 bytes
SHA-256: 279b7a56f3c4140e020d1c544c1e9e5359b2ca14251ecb82e1bb3fd01b85dbbe
font_03_sfnt_off00015d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D84 16416 bytes
SHA-256: d90644fd0fe835d827e2db0df2bbe6989b02a55352eab1e9d3a2e7b6c632d5eb

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