Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9858d87c9c782d…

MALICIOUS

PDF

121.7 KB Created: 2021-07-08 04:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 50299f372c4ee3d3c5877d9f875c0247 SHA-1: 8656a9c4aa35615b77b226713dd66ae0499cc9f4 SHA-256: 1d9858d87c9c782d12d86bfbc64d49a1f7aa96ebb34b8416841802a2afcbb0d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are either compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely designed to trick users into downloading the linked PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9702

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nestuby.com/userfiles/file/93464911560.pdf In PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d506ca51---wiporuk.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b55aaaf10---rivejogaraketuj.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608401cbe2dd7---45343422944.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe5f3e927b---manezafix.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/bidokedowumatuvobavo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9f2js44iaejp623qvs8qld4pd6/repuwatogiwak.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rekusofufixumabo.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/52329206773.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/budisemigerazetiweladi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bf4fccfb8de92b215728c3c55d7f11e3/44729183167.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a7f1dc36f---zepexux.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4366715c12cfe60c220edc0e0e2ead8d/46129990118.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/matijibasiluditawigodexip.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/15191479031.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ba9a05850ff40779de6185e8529e18fa/xodakupu.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/95441856803.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee95c57d57---wulipopufemozobana.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce2c3a1448---53592048847.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084348899d64---tuvegovanisemulefilim.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb18031bd5---46575344559.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/gemiwisagabenama.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c217a32e3---70546812440.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/pelujiv.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9f7313e2a---nixuxusazikaven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+the+word+warrantPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A6 9424 bytes
SHA-256: 9cc5a7dc7a4d62b457fb4f2dd833c082934993e776c226d74722452c93d6faee
font_02_sfnt_off000152fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FA 10496 bytes
SHA-256: 3db9e187f9c7838a4f4c8400fdece2b8d7573159e41421855ed102080ff9a013
font_03_sfnt_off00016a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A9F 29100 bytes
SHA-256: c529ded7b820a5f57913283d657ad6a83abef2f3580866d118330e1e78dfad9e
font_04_sfnt_off0001ae55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE55 22948 bytes
SHA-256: 25aea984fdb435473b7e46eaf54041b8e960e976fcd3323c3b0baad2e83f0067

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