Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e8b8c4a24968b3…

MALICIOUS

PDF

92.3 KB Created: 2021-08-06 03:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e22e08fb0a760f26b1c1fea2a7ab2bb SHA-1: 51af88281a33b7c259f1ba4dc0b5ae3b636ef341 SHA-256: 98e8b8c4a24968b31dba8c8586f16a55519b5b5faebc6fa8d1792a7645a29e1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and link farms on disposable hosting, strongly indicates malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://drafthe.ru/uplcv?utm_term=how+to+start+a+contract+cleaning+company
    • http://studiorapizza.it/userfiles/files/12885881549.pdf
    • http://castel.lu/userfiles/files/gokodirofewubapana.pdf
    • http://hhtaitung.com/CKEdit/upload/files/47856657443.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c652e434463---51583152000.pdf
    • https://strechybenesov.cz/content/2722365960.pdf
    • http://diversecityuk.com/userfiles/file/vaxuwe.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dddbf2c6060---mudegumebozifepafi.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080aceb87008---didubokenof.pdf
    • http://goldnumber.info/userfiles/file/98654718376.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e85a28fba---xetumowanevilog.pdf
    • http://sk-massimo.com/js/upload/files/56903468375.pdf
    • http://fishtech.org/uploads/userfiles/file/file/filex.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608054031b90b---29033362351.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec44470957---10652895471.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e78423446---duwopabumaruxalexukuno.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92abc6e28e---40075533238.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/bovudiwitewabiko.pdf
    • https://cplastik.cz/data/cms/file/luwikexutomupud.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/99810772732.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad47680b6---67364944517.pdf
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/vitelaxivejab.pdf
    • http://hum-lucknow.org/test/fckeditor/file/soxiditakofuzu.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/bisuvu.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f6d01d81ee6cab3e4ba9a33d4584dc84/48917774562.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_off00010489.bin
a54ed000e2e1110f49bb0ea776e754ffc1807375b66399fefa45954fa5d82a34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 17072 bytes
font_01_sfnt_off000130fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130FC 16792 bytes
font_02_sfnt_off00014913.bin
7a101838322a24cfe7fbde421aabad7f31e0b194d45ceb24df9c534801779e29
pdf-font-stream PDF embedded font (sfnt) at offset 0x14913 10908 bytes