Malicious PDF — malware analysis report

Static analysis result for SHA-256 3499d61acf38a273…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 15:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01ab9ff5024bce35f777cc0f316920cf SHA-1: 14b40702457655361f5efbe2511d1a0d9aaf5255 SHA-256: 3499d61acf38a273b041a0acd08c0141a3416325fc66371b8490db2aeeae84d8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tokstar.com/_UploadFile/Images/file/tatozebuvuzavunete.pdf In PDF document text
    • https://my-natural-style.net/upload/files/lofubeporojoboluji.pdfIn PDF document text
    • http://fields-on-earth.com/58025972355.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac930960f9e---2656628116.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/jijevigixabufipotafusetuk.pdfIn PDF document text
    • https://limsurempat.com/contents/files/60236760048.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c421e35858c---jajex.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/u1utha84slh027f9e3viuuf3hv/48581448265.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/993fb56b702c03466de63c5aa502a4eb/58445344826.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9ce850d743c6e65989827846cfff5c1f/3257373708.pdfIn PDF document text
    • https://proxus.nl/file/45067843824.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/defitedezowubise.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/wulek.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dca62d40c4d---goliratam.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/kogutevemajuladiweguwaw.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0758f38b40---kukunerekav.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/n2fp7pod1k7vu3engmm29vogu7/26307063915.pdfIn PDF document text
    • https://digireg.org/upload/zanukigogiru.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/10940513941.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/mexabidugamafusudi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074977b9d6ec---pusunorodegugaleka.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/lebalem.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdaeac8a105fca93276ae4c5a388bac8/55017129613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=antidiuretic+hormone+adh+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_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 10752 bytes
SHA-256: 82d9af27779e95afa968e00c910a1e2ee29b416640103f523a58b1f2c8b4165e
font_02_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 18200 bytes
SHA-256: 7b6cc91f3e921122a62b5fec41d4f4c66b747283dfe6d9ba70324da1ac1b1b96

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