Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd20939945b7a14…

MALICIOUS

PDF

87.9 KB Created: 2021-09-11 10:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf9b1a257b80d02daf414ec7d4c0dbe8 SHA-1: 3fd82ee254a22606791cbc24da85d70ba6f6ecf5 SHA-256: 0dd20939945b7a1414ecc2c1256fc33c6fe5f9535e51d08d6b58c27ac180517d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to potentially malicious content or phishing pages. The presence of external URI findings and the compromised CMS upload link heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=rbxfast+promo+codes+2020 PDF link annotation
    • http://indyskischool.com/ckfinder/userfiles/files/70841002961.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/41441969086.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/votesuwazitoj.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/ditowufazixowagovol.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/kidunopi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a8a54721---31652592871.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/xaxotasutaruv.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/bomuru.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/42240240552.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9c6812d9---zizekijelekujerekapoz.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613683370d924---wugukesolozenanalavax.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130db2d135ad---vujamudanik.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/nazebebefifatagurevofuzow.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/jubuvosepixip.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/wupoxotuzixabevofab.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/fimudebinelaril.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/varodofibofukumapiwugogof.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/79412644850.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/76046874608.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/23388787385.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/fdce69adab6c168487505efacc1a40d5/42282914819.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/59928177766.pdfIn PDF document text
    • http://hidramaco.com/files/files/52088427643.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/kipakopunewumure.pdfIn PDF document text
    • 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_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 18852 bytes
SHA-256: 887947f73ca27fb24db7d60d98b5c4fc7e02c5544d8d1ddbdfd08eb985a5a12c
font_01_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001386b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386B 11068 bytes
SHA-256: 325d9683cf4536b40a1ef764feab518222e7ad6e88f70ad872a4b79fb4bc4861

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