Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a52a50e2ec0dd2…

MALICIOUS

PDF

95.3 KB Created: 2021-08-17 06:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 524d7713e66b55f4b4f3b5acbb8bb7df SHA-1: d8348f43366455628fad4d2246d9dd9aab557b98 SHA-256: 30a52a50e2ec0dd2ff8fa23d2866fe5fcee7c2b7698102bd38a4d35e191b6421
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of an embedded JavaScript stream further supports the malicious classification, likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fiberglasssupplydepot.com/userfiles/file/46718468005.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab24aaa574f---99290429272.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/dewekomedamuju.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f789a33d---fipexiwosujopowobojosi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/eda8398fcd0b372b424653def0e424d7/pukisexapatureru.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef314e2bed---xolimowavibuvorobibux.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/68469506839.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/jaxefipiwavesixan.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089f5dfd2a10---18158434438.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/8069760993.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/66802738631.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc5a49759---32716124989.pdfIn PDF document text
    • http://ceroki.com/image/files/kawoteralebakefuxa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/99b720d9d6ba5fb563b5b2c0f03d5bae/lalodelubaxo.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/minegatijepevalemogujeno.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0cbb481b39067340e6568f54ecaa039d/gobasilizabutitisux.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b810cca03fe---xedomeporusenev.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/38494099753.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/oianhb4f6ijbuhgog75v4j8qd2/21693007046.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/vetajowuvagasibosav.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/namuro.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/kukamafil.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/lejepolile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=nintendo+3ds+emulator+for+android+uptodownPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 18892 bytes
SHA-256: 688230a7a6b380f1429e353f1b96bd46425973cc6a5e938b337bff0a7372f21f
font_02_sfnt_off00013c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C33 10992 bytes
SHA-256: e66ed1c15d54d2bdd5b1dd5f01e846aa8831be0f45ba6c8be2d50660abefb89e
font_03_sfnt_off000155c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C6 17160 bytes
SHA-256: 32cd2babc1ae664e1b994286e8b0b1bad855dff6b12a359867d5447af5184428

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