Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4f30929cee5ad3…

MALICIOUS

PDF

97.0 KB Created: 2021-09-07 05:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6448b80b06e7389a033966cf84e65ace SHA-1: 4520c5134982163968d8e371144a4258cb20cac4 SHA-256: 9d4f30929cee5ad3bdd237a4ed81e680b118e4cbb93841e56e1453fa1199bb31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://theeultimatenetworker.com/ckfinder/userfiles/files/21804636837.pdf In PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/42193041459.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/8443811609.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd62d57d3---5682148450.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/28499308446.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3eb810439---zumumekumupevipudalad.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e05e0c6d7e6---86448034389.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6312add6---jenopogajexesefisurej.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/52450862062.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/45528862571.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2896b302a---gijixopixaxegoxis.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/44180371993.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/34142144052.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/5011465688.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/37130777994.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/gepuwobalirip.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/aff0dc2418f9af60fce00b60e36afacb/30685691698.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974b36a503b---fiwuveziwuvajalo.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/72164397687.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/48842946065.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/m77nb953sf8u3bacf8ge4al6r7/jugok.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9cdc0bbcbc68ff2f0a2cca4e25dbfb5d/40518296357.pdfIn PDF document text
    • https://zzhqhi.com/d/files/ruvixixekagidepezexiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=concrete+design+handbook+pdf+downloadPDF 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_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 11248 bytes
SHA-256: af8ad8fc649f83daeaf811c35bf76ab44424a08e358a645a86202531134f61d9
font_01_sfnt_off00012c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 18924 bytes
SHA-256: f2cf8b2c17e833a5306d147222a37b46e542f847e9ba6a8c23a023845e4c36be
font_02_sfnt_off00015e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1