Malicious PDF — malware analysis report

Static analysis result for SHA-256 256f9a98307cb002…

MALICIOUS

PDF

74.8 KB Created: 2021-07-24 07:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 352d3cdc14b78856b2cb9eda4a7bee3a SHA-1: 2a8fa892967540618330ef5599bf5fb13cff2119 SHA-256: 256f9a98307cb002d068b8fe31cb9ac421486cceea8eb0a0f0015532b6203cd8
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://embassyinvietnam.com/webroot/img/files/47768531443.pdf In PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/komofobew.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f13ba4a3d5f---kotigedo.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/pevajoves.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ubnehdpoknpo6556ua01ajbk68/purupitisezagosegamimuw.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/mudapukukimeluzadomerevid.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a7deef64be6---27395263346.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69446e0a0---bosugas.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b30ce29ccb67a0921f98c86691f4951e/35949513228.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be10a71457d---mepumetenizogujetixurej.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/jixewixabopemumatig.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/83018814274.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083521995214---xomufowoke.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/bonozi.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/tezojixefagafu.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/fetazokovibolekagesusu.pdfIn PDF document text
    • http://ccsl.asia/files/banad.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160767e3d182f3---73080260930.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fab630400---93372341914.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1ddd9e5d---domujuruseloni.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7b684f217---79811082876.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/genizawovojevo.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/8900538221.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/fafupinom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=jaffna+anjala+2+song+mp3+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_off0000c2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E9 10916 bytes
SHA-256: 6386cbd88fec1b3d7f2c83d6dbff4f49308667456d2bfa15efeca91ed41cd210
font_01_sfnt_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 15636 bytes
SHA-256: ba8217e1ac4199e7f03c3e9f4a7c3499c633b907968e6113bfcb28d618998dca

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