Malicious PDF — malware analysis report

Static analysis result for SHA-256 18adf4fc15730040…

MALICIOUS

PDF

94.4 KB Created: 2021-06-28 21:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f11c607b23f7712484fe66ec60d77223 SHA-1: 9d2baeca720e34bda7d2f45f529b2b338eb12f26 SHA-256: 18adf4fc157300404d77762bc85876feb69c3329c87c3f79286e45e3600043bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests potential for further malicious actions, such as exploiting PDF vulnerabilities or downloading additional payloads. ClamAV detection as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=hamlet+act+3+study+questions+answers
    • https://rachelrom.com/rescontent/file/sunamixig.pdf
    • http://rocb-ap.org/file_media/file_image/file/58886262211.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b895bc8ee08---kamokevofimiwodasawes.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802f9d40f4---gibapimifituf.pdf
    • http://cesishotel.lv/res/wysiwyg/file/tegexawiviremun.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a750b1dd16b---devutixupofux.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/06cf6e13104e1c8be4d4c791f9deb758/33710425218.pdf
    • https://berbagiangka.com/contents//files/39220935743.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a4d48f8e740648129e7e373efe2e0e4d/93549554344.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f6050d7442e0857f9647e8ee1bed3769/fadibegitalagafewej.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726ce592050---2656812697.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939e944dc91---43940127294.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0aa48101---tarepelebinozomapuwoxuse.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/zapefemeke.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5383225c7---poweposikosadaverubik.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607099dc642c9---55179193066.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf2e1417a---pujag.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abe143c4978---544545160.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6b51b93b---bafuradodipewiwelezaze.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_off00010dad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 16792 bytes
font_01_sfnt_off000125bf.bin
b09e838a8c6040ec26f973943746ae3b92327eef4c8fce20cc9884a4f44461d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 17296 bytes
font_02_sfnt_off00015286.bin
dbb96cad7d7fdf39415e814211b72e34d9face7c41405906127b79a10aaab75e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15286 11140 bytes