Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce8c7c6e2519ce7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 21:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddb59ac20c7f81525c397df154e3e9dc SHA-1: 0cc1627c7cb124ec4b072ced828c7724c418e755 SHA-256: 4ce8c7c6e2519ce743e20ea4c688248a7f067e97d63eb6c4261a3a37fd111758
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tiramisu-o.com/yamituki-n/uploads/files/xunuziv.pdf In PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/gaganagovafore.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/psf4sgd2k6jvv7tn0i84dnedm3/giboxe.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/50869198312.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/54701618444.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/sizarabadines.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/xewekunimux.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/af478708021a3fad97c335f098870b22/refevavitezibuj.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/pafinadoveresixebumoboza.pdfIn PDF document text
    • http://rld-carbon.ru/file/96070775993.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/furanizametotedexal.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/79512493492.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3e29e9686b3f8464b2ceb2da039ee06c/jifetozogivejujejanatotor.pdfIn PDF document text
    • https://angkagenap.com/contents//files/nafamu.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/39110480679.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090416535033782.pdfIn PDF document text
    • http://0930actress.com/files/files/98155684415.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/zazidiguvuvituz.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/wokadumapisexetuge.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/12985309505.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/k1encmgpmituftbrq7c4i6bun4/6294752571.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f083a7beed---vumelegulatom.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/joximesizumenuvovij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=old+vaillant+combi+boiler+manualPDF 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_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 10692 bytes
SHA-256: a800b235325c3c8caaee1271a68656f90694012b9056bbdc6a602cd0aaeaad35
font_01_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 18596 bytes
SHA-256: d463f3c013caad272efd94687fa2c99237abcaa0e6cfaaba665b8feadaee0eaa
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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