Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19c64400bab4d43…

MALICIOUS

PDF

73.5 KB Created: 2021-06-26 20:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4092353a2e898a3679915037f55d5e77 SHA-1: 3d3699dd605522dbefaa06cc543bff34c4fad4a8 SHA-256: a19c64400bab4d4383412b059162f40a3e70675207b45daaeff1ea09ce897b8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and link farms suggests the document is designed to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://irlanc.ru/uplcv?utm_term=to+start+with+meaning
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodovesuwakeramov.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/tjbncioa2hc3vp3n20ulq3mjif/donefan.pdf
    • http://prime-standard.com/piceditor/file/rowazisibikunu.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0811975b---vupovejefopowivetubek.pdf
    • http://asahiru-ban.com/files/files/zitizexug.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/9f56bc63d7e576c939418a1f6191273c/xonilado.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607226baad5b2---xakimexerak.pdf
    • http://dansecyr.ca/pdf/file/moxinim.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/582f3df8c43be52ed1e987eb205150f0/kumobarexeze.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc1cc15ec---xidojetapubenejazuz.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/74577832303.pdf
    • https://artbynela.com/uploads/file/romaxevelasola.pdf
    • https://bbpartner.cz/userfiles/file/vobufofuwasudujulanurapu.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/hiemd0lsm7fdpbt9p4ivnl6j37/55049804471.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e60bc2c7c---95012273957.pdf
    • http://santamariamikado.com/uploads/files/42137887446.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d06b51bd8---31513734181.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bcf0f63f---verubepojakuzizokupu.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968ec04d70d---gejumava.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb1e9de952---rovimozekoroseloku.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/43def2256ace2eb0eef7205d26cf7e0a/57619887299.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_off0000bfda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDA 16792 bytes
font_01_sfnt_off0000d7f1.bin
899d55cc77ae648a8331fa93571243589f48774d0f2947b25de5082f64f72546
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 10556 bytes
font_02_sfnt_off0000efec.bin
ff3af24f14a422161b24a0f6033152a7f7ebd7bae607c7f2b8ff31b0da36a1bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 16128 bytes