Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a0c857583648d5…

MALICIOUS

PDF

80.9 KB Created: 2021-07-29 21:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f73cae5877470c3fcb914742220d2832 SHA-1: 528217c7a8df308b34c80357177c02e9d1d449ed SHA-256: 95a0c857583648d5ccf8ce412755974fe2dd4c6d0206550b4b0664b41d856dc1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as Pdf.Phishing.Trojan. It contains numerous external URIs and link farms pointing to compromised websites and potentially disposable hosting. The heuristics indicate a pattern of linking to external content, suggesting the PDF's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=roya+bhi+tere+ishq+mein+mp3+song+download+bestwap PDF link annotation
    • http://blessingsngo.in/userfiles/files/73826106255.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/6955513633.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/pevb2sgt9ctrqmo75ur9h536dr/fedibotuvinanetumuzefut.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133c1ac355---pizuf.pdfIn PDF document text
    • http://accronline.com/userfiles/file/81771083451.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/rewilopepizagavi.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/kukinowi.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/sofobunoxutusenu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079a946e8de7---xulekugoxiziludetupuli.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff22347ffe---notuwurejevopesuso.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/jolavova.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/9lph9ckkcpfpbdf97iflr7hueeb9pv61/rutisokukim.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/topukof.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/torudawotiguwubip.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/06c59a3898b524df4fa56252e10d5086/53366264343.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/4a36bfd2e3fd28eb443c535898b5d166/dafukubokitewojazupebux.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f02407efb---pijadurote.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/watagelufilerudedazipada.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/xonovajizinujowazezi.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/weluv.pdfIn PDF document text
    • http://strandedtattoo.net/file/wufawovajasiz.pdfIn PDF document text
    • https://sharenkon.com/files/91100687511.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ut776hu6fk699eoegdo3jit8v7/mopazaborurataluvabeve.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/redaf.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/21028654893.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/givapezavepur.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_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 16884 bytes
SHA-256: 4640dd2f1b0f40f5ab1a06f5fc46826ab2ec341cde52a729e4315f3dac7eab67
font_02_sfnt_off00011a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 11544 bytes
SHA-256: 7c933dbe9dc785e25042196aff1294c522b105ed9fbaa2015236ce998b212c00

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