Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d6282554db648f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-13 14:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e04dbec5ddb96280441a0402b0dc7271 SHA-1: 48c5f94d701d1b6ce073a07133f8916efac8c15c SHA-256: a1d6282554db648f88cf5b9a9f8578ef5fc76e4c18f79ea83643d676f869d7ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm structure within the PDF indicates a malicious intent, likely to redirect users to phishing or malware hosting sites. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://actor-conseil.com/files/file/96064990002.pdf In PDF document text
    • http://chongthamnguoc.vn/img/files/30770490687.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/ninefikemunuvese.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/gomer.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/57258729925.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/gibakonetat.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/pulofupomabidumulesusu.pdfIn PDF document text
    • http://carbontuning.ru/file/zisasifisig.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/92146133566.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6lqopc9ugfapli3jugb4l4t1sb/62186874215.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/tudigu.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/sunikubazofivotumunurujex.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/radivokelowor.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374bbf100de---wusularamobagewumumasabuf.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/bfd3ed9c6d7d6d9d6f71f0b1b9e7ac00/27176390814.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/gizijiferuwup.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/figiz.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/ripuxetax.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/76266579105.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/fivorepofirufenokaw.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/84947806219.pdfIn PDF document text
    • http://sdes.in/uploads/82368555422.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210906055149.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/rarevalugepataj.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613384bd9ae42---21474847079.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/79072252677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=werewolves+within+123moviesPDF 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_off0000bdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 16456 bytes
SHA-256: 4b003791c62ddaa938a0e2f3974c5c90a97e08587e0d79b20a63ecea65fec55c
font_01_sfnt_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 10700 bytes
SHA-256: 896428c829e58a35f390cf62672c153b3f8a39e5555bcf782642d52416f419f9
font_02_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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