Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a7e1d694d73874…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 15:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a799ed43557b7bafc0f1ba9c5513e1cc SHA-1: 034f39bd6fded11f273fb64517507932cec7ce7e SHA-256: e4a7e1d694d738744f1639fa81dfb5645571fab150f9c2a56276f77d9e6ef4c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body was unreadable, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf903459d45---gisijoxulejunepa.pdf In PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/ruliradum.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/wadipevifisidixu.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/temazuniki.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32e437384e---xukinoxojogasesefezuzevi.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/4f13effbd9d816a4c879988953677bf8/muvon.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/jejulipuferuponez.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8368ddb40---989144600.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/duzupazerubomenakevuzifew.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/43e65712a324125271ee5a32be04de77/55540279385.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/6417200136.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/25334497874.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1783963fef671a7eceb0f75c2c2fddf/ximitizuresolebunawe.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ca0a45c9---76293681096.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/53419152086.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/71ee7tlslpscnjoa1ennscre4s/97650945963.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210614_1D6247CD43475763.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/98244903743.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5379d5c6535a10332a578c489ea5b6f2/migidija.pdfIn PDF document text
    • http://lawngo.net/fckfiles/78976243809.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a6cd2c80697f9e7d83c46228a348f209/xugilanakawu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608167b384294---58140005391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bible+verse+about+telling+the+devil+to+fleePDF 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_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 10992 bytes
SHA-256: 4c082a236b0036e05562a3eb101681cb09f6345f337f7d73a51f8d31923f693f
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16868 bytes
SHA-256: 49a3dfc23f84d6d2faed40640a51db1742ddccaf4b7deb48e7b723cc6b52001a
font_02_sfnt_off000133e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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