Malicious PDF — malware analysis report

Static analysis result for SHA-256 896cd2bcca5b3169…

MALICIOUS

PDF

83.9 KB Created: 2021-08-20 20:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5df34d80c1defab2ee3a2bd1fb290a62 SHA-1: 8827086811dc0feecd36125921ffab3a8f37a044 SHA-256: 896cd2bcca5b316960b96a79ff7e1d75d3328df1ae3acbc2c1c393877fa64590
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 of which point to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these compromised sites, which are part of a link farm designed to obscure the ultimate destination, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb8a51a8d---29234739142.pdf In PDF document text
    • http://eska-lift.ru/userfiles/file/53373734735.pdfIn PDF document text
    • https://ivanamihic.com//files/sojojaboxefodegowoba.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/wazewowepojerodanoxejab.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/lufozejozawujavud.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8qbi9km2fhh81tq153ftipsv9l/mozuxetizasadofusosowutu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ef9dcfd5---wozegegilidubo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b6ba3a565---sixikudusijixipabenuzak.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/96339962465.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/86314327974.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/jegafujupi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a808a0ff9---tapurazumewakanufigokeron.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16105a8f97d64c---79206903870.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/nenud.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/72337930580.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/63344292632.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/rotuvujuniwaw.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/28566039741.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/73157266172.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/46234105690.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/69840943070.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/remajekizaxuziwemesu.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/54164875550.pdfIn PDF document text
    • https://egca.fr/userfiles/file/5896940770.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1ce292e7---9916851471.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/bimosofomukisufemopej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+connect+rgb+fans+without+controllerPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 10932 bytes
SHA-256: 30faefd5829d7e9efcff8276eb2c4eb359a4be2ebf1028d53d30bca5c2ae00f5
font_02_sfnt_off0001161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 16636 bytes
SHA-256: 4b66f5777e5e14f5a0cec60b75fba4919414f57e5f8a36e024ffd248717e75fe

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