Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b084e504d8d1bb…

MALICIOUS

PDF

76.0 KB Created: 2021-08-27 19:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56ef422d93d04282f3fbf99fd6881147 SHA-1: e771ceb3b93685b33eeb5559aab54a0de7eebb1f SHA-256: f8b084e504d8d1bba5743d887ec3f14855dbad02702fb9784ee9a3f943df807c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious websites, potentially for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=baby+room+clipart
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/r70f35d93hrn1k16cdfqaokq86/38505592741.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877a9344e02---21542269907.pdf
    • https://penal-garazh.ru/files/53297902791.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b6a74479b93376ef26beab4e967e6654/xuluko.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822800efc35---16533918963.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6fc1rnssl6ncvj5f8hiq7d3elf/4211651879.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609082a03ba00---4682654447.pdf
    • http://arch-teh.com/pic/userfile/92501186133.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/fe9d6a99aabe2196aa0008f2d9cbfcf7/kurivamagife.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfcaea5010---35736781368.pdf
    • http://sugarfree-gelato.com/upload/file/84726920563.pdf
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/8823161951.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a4169516dd12861b87de71b74ffe06a7/5503462757.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf618bae43---35021455385.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/05d48bf81d1935163d9c87655e1ea265/gikul.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/ginujubutewu.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f38b2ac4b97---rosupugakugetuvate.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082897d68267---jibobujad.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/857f5182131e5df558f35098513487f3/wuliwarijijisozixasan.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25a00a19d0---xitusujimusovorovuwuw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BB 16792 bytes
font_01_sfnt_off0000decd.bin
ae4434fed48e6060b05f95480ed2d49b19d468461f768ec434eda240fc15bc48
pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 17072 bytes
font_02_sfnt_off00010ad3.bin
5451c3fa9835d91ed245ff7859981bbf369eca79b8895d011a505f119f4a5287
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 10440 bytes