Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c179902e31f17e…

MALICIOUS

PDF

99.6 KB Created: 2021-07-31 15:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0b43780b9479ec5f7943d9929088dea SHA-1: de5150c5bed7bd4f649d8444317ffbd67c521d98 SHA-256: f5c179902e31f17e15d8e0cf5e57ea76aa4aa75284e5ffb5daca29c9ad6a086d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://crysiq.ru/uplcv?utm_term=beginner+spanish+book+pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2da3db8c749a635560292b6dea9de81a/zijagonaxeguw.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084b6e93d9e6---zojovosiwulavavuwu.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a059973036---retopewunusotanok.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/novukuwitip.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/dco0nt3ljg3vt1d7mv8rad7svb/rukokeburasofu.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba076c9be---24413365965.pdf
    • https://oxfordjsr.com/userfiles/file/lunukulakuzipivibiwutaxi.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7cb873e65---6749746837.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084389e81a08---72964944647.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d91aeab18---58035349892.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb0dfb265a---numivaroribelup.pdf
    • http://k1a.ru/images/files/file/5197471868.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9922b954c---siximeke.pdf
    • http://hoanggiaphatland.com/uploads/image/files/50832329085.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607157021f3a5---nevapimavamevoxaz.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/kibopezirenew.pdf
    • http://adabaskimerkezi.com/upload/file/99762887195.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fb01d6884---bapefogesugopuwe.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c4163b53---28032137267.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25dd39764f---50025149133.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/93cbde5b70df00dd9a60897952e87d40/lolewogefamube.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa150ab999---ramutugumatifibugu.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/92019438109.pdf
    • http://www.frank-diagn.hu/userfiles/files/kesored.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b284bf6506a---luxufamotoxi.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/68228105300.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeab286cdc1---zekadifutagiwexomab.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_off00012207.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 16792 bytes
font_01_sfnt_off00013a19.bin
2a90a1c3b1054c94023151a7fbd1a495f52bc1c9fc692a73f65bd412eaea2e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A19 17148 bytes
font_02_sfnt_off000165e1.bin
5c099c171761361fabe4627a50f4747367510a0daffac9d8c6e93d1ede4327c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165E1 10916 bytes

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