Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4a81559278f380…

MALICIOUS

PDF

94.1 KB Created: 2021-09-01 02:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c074ec678686a442848137fe88f9bf2 SHA-1: 7837d2ac60382af8cfd146dc50083ecb0fc89d03 SHA-256: 5c4a81559278f380a832a6f77a88d36e9c6d6301f9a74c0a94f424db91ec5f77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://smidgel.ru/uplcv?utm_term=prayers+for+total+healing PDF link annotation
    • http://saydersan.com/firma/files/wefobufogolapipasup.pdfIn PDF document text
    • https://artenika.pl/fck/file/zudutifizewufadijosemixeb.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ca63e23a---zulosaforuf.pdfIn PDF document text
    • https://umartravel.com/files/kofugik.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16105ff37ebd15---1375346369.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/75838626619.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1212cd446af6ac377d48479613b7052c/pogojajelagovimaf.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2311fdeb5e---rivulutuximovugilekalo.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021072411031773499.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/10177afb71b70f67aa4f67175bfee821/pagulajojumobuziza.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161134109708a4---ragililizesulug.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/2582655238.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/jitaxovufepokivotuse.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///vuvosokedufufabiz.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/2116186488.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/28038409310.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/2173949134.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/64ae392800f95f85b353264aeb2e6357/xuvelutisobesato.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///23578066244.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fumojudip.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/47140331485.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/wejivipofutitawal.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/0uvtdj3je8ui7pdflh5krv5llg/53741721908.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9f111567---pakefarakaxudowaxikiz.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_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 18136 bytes
SHA-256: aae668bd1bbe0b6c7a0590e89b6ed1f6d62171a133481bf131b56ddccd08f8ee
font_01_sfnt_off00013a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15249 10608 bytes
SHA-256: 4bddf4ef9a9facc18c62e24fd5ffd74d083f67944b6548bbdb35e5f3722a2bb3

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