Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3fe5ee669c46c6…

MALICIOUS

PDF

85.5 KB Created: 2021-07-22 02:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30fe6e4c1895cccc6615f195fe7eb20b SHA-1: 31144f46487f02800e93699223fa670e3d4f75c9 SHA-256: ce3fe5ee669c46c69d0da4088b4f484958e9e00860329946a4fcba2d1b9c7763
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload from one of the numerous external URLs, which are often used in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e89f07bfbc512cd4514bc57b090b21a5/48329817348.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/1f98f705a89d11478c411e2cf46592a9/junomupalol.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c380898e4e---50763406738.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/29122709130.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608516333e678---wojebopunumaganuletul.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1fdf1ef57---pepuxonizan.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae89b116229---kuzomokefezumasine.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f28d2169---10552701796.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e28604efb---wizemedimevi.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a95313ae55f---24221329804.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dabd10c6522---litesawuxikazaj.pdf
    • http://busankid.com/webfiles/board/file///31705103632.pdf
    • http://adams-gold.ru/archive/image/file/wumimano.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/4b43f6d4060c1cbe1cd68cd0fe5f27ea/31881948261.pdf
    • https://ctapigroup3.com/contents//files/kubitepekotebodudukalu.pdf
    • http://www.asslar.de/downloads/47290499838.pdf
    • https://alyosserspneed.com/userfiles/files/10301081176.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/n9tdumkcc7gmieocjber2m1i77/73288976000.pdf
    • http://inphilong.com/upload/files/bopigu.pdf
    • http://www.radio-kum.si/data/files/87026965770.pdf
    • http://shopcode.ru/uploads/file/japekig.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a222d2c1e4f---60340334262.pdf
    • http://akicgiyim.com/userfiles/file/kazadikopozupe.pdf
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/vinotuzojevotegu.pdf
    • https://datxeninhbinh.com/data/dulieu/files/17085357872.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=camp+crooked+creek
    • 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_off0000e8f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 16792 bytes
font_01_sfnt_off00010108.bin
99605e68770d213c2bb16d2a7c972ce4ce2a2bc36c71a7b5cad21a0588658a26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 18408 bytes
font_02_sfnt_off00013118.bin
ee5a486824281fbadd5279e5455ef53609148d673ad32606a3b0673d08a0e025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13118 10292 bytes

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