Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c79faf60285d785…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 05:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbfae93d2af15ffdbbf29f0a706f4f4c SHA-1: 701c426e67113db483e02b312f5b07348775dadf SHA-256: 3c79faf60285d785653cb24f90ee0b645d85895f7da75d598dbe43c212f1f356
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/387d945ba01a26b2b860a06e3262dd91/nigukivupomotuvolev.pdf In PDF document text
    • https://drrajanmahtani.com/userfiles/files/ropesipufujasoki.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160846f8d16f05---xebekonanetuvu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/c33140dd8199082d740427fb992369c0/zosuru.pdfIn PDF document text
    • http://gibisch.biz/files/files/67028815738.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/k3p7ibs5booedpjg7huecatp62/gozipomilaroriselunogoliz.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/guramosobaj.pdfIn PDF document text
    • http://kechengchem.com/upload/files/76221391341.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/60184756325.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109746700568---zeterurinowigixiboxi.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/foxujinazab.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe72be9e62---xosujolupup.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d1ff5e4bd025ca3d97e793e36375f1b8/pupuropivineno.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/lonekizupibidosulo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/vodalawulirabanamufa.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/molepin.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/25212208348.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/7b68eed1fd6f1a19a377d89279b937ed/97610870236.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/dukubu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5302813556---53152782942.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/91563599750.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/xesavazorotupifubimobobaf.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f7efcfc12---17972657457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=anchoring+script+for+school+annual+day+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_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 10960 bytes
SHA-256: 5fa061d5ff18b0d33792755d9443051bf237a4d11b10577d56346c3d07ed2799
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 17872 bytes
SHA-256: 9b0c8ef9c70437617722c133ed602f05d56a2ef1de39c5e0c93ee561754b14ac
font_02_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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