Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d35c83884dc248…

MALICIOUS

PDF

97.8 KB Created: 2021-07-24 02:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 068410b123c65be48cef3c3d69861a89 SHA-1: e86f91f4cb28ca7a2cc79004b04647c6f8614e8b SHA-256: 17d35c83884dc248d6fb85d2e1d0cc6ba97c96584feb77cc8ce36920990baa33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised upload links points towards an attempt to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 6

  • 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.
  • 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://cestovni-postylka.eu/userfiles/file/98541219228.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/fumavekem.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1604c37a1---80791879240.pdf
    • http://mmdplus.com/userfiles/files/20210616_034854.pdf
    • http://accessoriesunlimitedinc.net/catalog/file/28506522943.pdf
    • https://landbar.com/upload/files/sokosefogedoniza.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83bc30bd34---vafixofizewegazuli.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609846253df6f---kapuzolovibesisitam.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c246456ea64---zosejijifofusel.pdf
    • http://lagostena.it/userfiles/files/zazutatoripamojitenupaba.pdf
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/gakexajimesunuwoxomoremop.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6koegdcnu4knsaqkukptrot4s5/25977772582.pdf
    • http://erulingua.hu/uploads/content_files/files/vedurubofonitul.pdf
    • http://faurerom.com/userfiles/file/16562743393.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/fegigigenelolo.pdf
    • https://manenshop.com/upload/files/wedigorutami.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/tevubuku.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1786355d5---sumuferi.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/wufirogagiwelime.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813de4f146a---65693543805.pdf
    • http://computergramm.com/userfiles/file/49383403533.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/adf85f6d40f6bc06fe9dd4fad51b64cf/jajemefe.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa650b5af3---6140915781.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/2b84f69f1aeee43418f1bfda2f2388a0/73537061555.pdf
    • http://canxetaidientu.com/images/file/82022453747.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9022436b98---54560223059.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/cva8f0e2df9ma6a02pl4ubchp6/jodam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=vitamin+d+foods+list+in+bengali
    • 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_off00011996.bin
a646711c6dc23a2cd72c17445afd25e34554145ccf2758b378ce3a3e8f656a45
pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 18004 bytes
font_01_sfnt_off00014938.bin
2ebae8c399aed6daab817f49dbfcc48248330ba21b9355bdeca3fba92bf9d4e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14938 10708 bytes
font_02_sfnt_off00016198.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16198 16792 bytes