Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5e171be63914e1…

MALICIOUS

PDF

69.0 KB Created: 2021-09-14 13:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7f6dfd664e950558043d466c34f0689 SHA-1: c2d4294661aa5216945fb0783fb4aadc88e6a105 SHA-256: 6b5e171be63914e1c89709109d843f67bd99a095b200df6d88c091ceac8dd2b6
164 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://garagehayashi.com/js/upload/files/pagixuwavexikeka.pdf In PDF document text
    • https://arendic.cl/files/nijigekozeliloterireseki.pdfIn PDF document text
    • https://techlan.pl/files/file/82904807048.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/vozagoxanu.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/62554522559.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/jisiparipomubewerakub.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/70835381169.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/dapakovogisimikufebaf.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3286890843.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1au0l1gjqcqabk8kaf0iebtm3n/benosadofirodemujo.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/32316042118.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090702181673499.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuxiriwisefu.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/1165135397.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/60496235953.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/lasotosenawawid.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/nujudabukosazirosivomoxom.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/73069915436.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gfjp916ed26c93mup23onkai2t/24551147425.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d8f03ad678bfa4024d9307c197fafd4d/pirejowixu.pdfIn PDF document text
    • https://hobbypet.cz/files/file/dijifopo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/gofajugatidimexerix.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/35759299951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=guitar+all+minor+chordsPDF 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_off0000b1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B3 10644 bytes
SHA-256: 610882d4e0fe8cb91579909a821c3621c5e6fc72a5a882465d30386a043d2b78
font_01_sfnt_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 14552 bytes
SHA-256: 40198f4504d391057c76a06b8bf4dd0328b77046558a142d25b1aa1ccc636be9

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