Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adc27feb4ea787b…

MALICIOUS

PDF

91.2 KB Created: 2021-07-05 21:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7ff1749a119cefaf4f717cc29f9507a5 SHA-1: fef3abb9c6c15e38f1e71da1da52d8fbdc1470c0 SHA-256: 5adc27feb4ea787b4209810377e127bc441535510074a1afd43cea41ace51924
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to numerous compromised websites, suggesting it's designed to redirect users to malicious content. The primary attack pattern appears to be phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://krisoc.ru/uplcv?utm_term=oncogenic+medical+term PDF link annotation
    • http://ahkjt.com/upfile/file/5814291232.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/12ea34d9a9ed219b2cd7a97b4451f6da/87607501103.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/83644adf9fb34096ec11f20908ce654d/kuzafopaguzoke.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096548503858---vegojoregumufiwe.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/gamafelonokajor.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/23100218681.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6630483dd2663095674fb0d8d49dc3a8/76854966459.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/371eac4b1d26fd812ce0bc1003d7632c/wifojuwejux.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/53310251058.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/b5d577e52eb9f11180497b24e48018e6/31300765179.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/m5fttqehobbu94dj1g0qlfrsgh/25464561140.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081f20319f13---mudoxolapazawigubegi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b01793819219ada845f0d98e6ee7e194/nubewawu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ok119r2b624iaaugeqi2fkgn7d/79950209657.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1635b0fbea22551dba3436ef3f81e2be/venarojusenerasobedufivi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc4b6b1c0---sufogesugadidotoxagaxago.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/2368254413.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aae84cf3ef5---32421296146.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/35691477561.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/af0a48595cf762d56db6b01727f6d52e/zogidanuvofegitebiforumi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 17132 bytes
SHA-256: 9c84f9a543e9f3552562f05013b104f450be6343682d8e7a72bafacb06a9c195
font_01_sfnt_off0001302f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302F 10568 bytes
SHA-256: a9d3293d70ae380258b58c5d683ec46aae91bf5066c5dbb344fe1f447a1e6a7d
font_02_sfnt_off00014812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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