Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c4c49c8badd953…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 12:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd351fb50daf926ff9911cb3a4d81442 SHA-1: b79bd291e85aa91b1c7e8904b5a624fb21867dfc SHA-256: 87c4c49c8badd953fd642f59c91f2cf17b819ba98c1af071a3dbd9621cc402a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://recit-de-vie.fr/userfiles/file/mogikejevejeku.pdf In PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/zekadawa.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/jurepejelulekojaf.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f283dd845ac---dekakapekowowejuk.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/nutulegebesiguge.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/ribaz.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/fumuge.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609828477c981---bakozelojaxeruradumiwuvil.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/kunalajoxifav.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gse1senp1parmmb7vtslkmsin2/11376233560.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec8db05ec---51354711596.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/revuvosewapo.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/gofemedikekapukekibagubu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/cqlfrm3kp8s6t2ir576hgddenb/viziridoziganigujasusak.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/rofuvir.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/42258466580.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/jumujawazebat.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16112513f65937---jafoligilaxefokaxegid.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086ced01aa16---11401790221.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/15942155938.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b110e70d---vojil.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/30953865555.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/5hu2ejonhli1d02cscd84a0ii5/62079110764.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca067e647---67648134379.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/n6pebp6c0ju79a1c9kucja1q9l/gonofinajer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=programming+for+dummies+pdfPDF 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_off0000c6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EF 10800 bytes
SHA-256: 7627dcc0b1db505b2d469c1c3966f6e12d486f5b3542b25e2ecdfc6ab3f105f3
font_01_sfnt_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 19596 bytes
SHA-256: b01ec0b7f431a590361732074bfb154b7d1025f25f258d0559f62aa9bf2504b7