Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d007d67d1a396d6…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 14:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b81c9ddf7989e463065c3414bd1568a7 SHA-1: 2afc613db26921d693acc862b208a5c9f4ff4a9b SHA-256: 7d007d67d1a396d67bbca0310ae5a0e2176227a21013d31156cb6802fbde39d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including a critical ClamAV detection and a high ML score. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of these elements strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://daydala.com/userfiles/file/10939279525.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ptu1pf5d4tbgdqitdtsfu4sacl/62488884317.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/633c95e5a63aa6a4788eb699361ee202/fivofaruliwewosifapile.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/74512202040.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/285aabe0d0ed92243733ade26e3b3605/64787423901.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/41321829667.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/94786705211.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4db2a2258---2677150614.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1629366606/files/fuvivotejegorukogejo.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108040555294010.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/114acb232562756b8f35b23c8f981566/40368913253.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/bgetlcs70qb8rpa4fhtgd48prc/munotunifafolirelanorivuf.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1e9c5afc9---refulesunekojiwusemawip.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/saworina.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/75131092984.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/wavodibaxugaro.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/409c82f5e6c8d7ef899a8308648c0709/lawuri.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078720b26b42---nirujewupuxi.pdfIn PDF document text
    • http://alltechsro.cz/files/80605472019.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c5e620c8e8b724c3714603d0ca348b79/zowotetakubebezakosora.pdfIn PDF document text
    • https://www.nlg.com.np/assets/ckfinder/userfiles/files/rutekemipo.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56751788043.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/57649792551.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/jugatun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=scientific+miracles+of+quran+pdfPDF 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_off0000bd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD21 11100 bytes
SHA-256: 54713c18822d118e03baeee8c7963b34d20892c797f227f96b7ab13c8762d872
font_01_sfnt_off0000d6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 16620 bytes
SHA-256: d4885bc78047666eb4df8f54631287bc5b18e09d7762370b7fee0a183b2fdb63
font_02_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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