Malicious PDF — malware analysis report

Static analysis result for SHA-256 4971f463ae37fb8c…

MALICIOUS

PDF

86.8 KB Created: 2021-08-17 23:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: c8d7665cb8a6fb0b2b782840cf4b0bba SHA-1: 1fce5e94ff133e4702271fa397d4e72dcbd1bd27 SHA-256: 4971f463ae37fb8cba8b7cec08d0432761bceb89cb69c68c425de12a092d192a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://octvads.site/js/ckfinder/userfiles/files/zizubamutosibar.pdf In PDF document text
    • http://cancunday.com/travela/img/files/8701392225.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6711cf3fa---xofiketodipevovejavazoke.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/mulezenofifewesig.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160947d24e1d09---rofeperupuwarawipamekewi.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/87391402391.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/87187114411.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/34520568206.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/125771a7ff90ada3cf2e43f6294a78c9/sudepusuxomon.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/wazekejafifezovazesewudim.pdfIn PDF document text
    • http://chinalabware.es/d/files/bosetogigofazodudavokadum.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/98144278037.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/53839542370.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae7600798---lejiwelezuxa.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/13097161858.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7fa016aec---rusasa.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b140accf---vopupokiko.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/kulix.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082f22400067---jobedokamimuget.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5b713f7c---4500899348.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a6c5afc4ad0c3db82f9db4ec2e6b499/zozarupit.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/baab84f1b25f2f960950b0bbd61b4208/62454134268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+more+group+funds+on+robloxPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/vogapuxijikisaforivijado.pdfIn PDF document text
    • 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_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 17668 bytes
SHA-256: 0b57ae4b5a21db5da96161bdf91b905094d089bca72de0fe97365e4001ee04b5
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 11004 bytes
SHA-256: e9450a22797daf535f4a83536116e2994e62ad65a9d8e4ec2782ec757e0ec9b1
font_02_sfnt_off00013564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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