Malicious PDF — malware analysis report

Static analysis result for SHA-256 280583bec4dd433b…

MALICIOUS

PDF

83.8 KB Created: 2021-06-29 18:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67f234d2ef85d16f82253206ca676db3 SHA-1: ac80f9cde3720882b0052b2a91ee4626e87373f2 SHA-256: 280583bec4dd433b3d0eefe9e1850e08c57858175da88dcd6f685fca21325d53
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://kovtec.pl/eurostyl/photos/file/navosixuwowisadivagadova.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a885ee9e29---91860998469.pdf
    • http://sl-light.ru/design/img/upload/file/dexupovuwebitepaxib.pdf
    • https://tckontrola.hr/files/kumomegebolulujosafub.pdf
    • http://harc-ias.vn/Images_upload/files/gitolikos.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc014356bb39c1b701237be629e4f2d6/xemakosadivujugo.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d4cf7bea7141150ec0d79c6d60be6fcb/61864757099.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/gtj40mvh3d5fl2e772inavf3ni/fodokopuxidebokupekoligun.pdf
    • https://bluza-shop.ru/content/File/joronilip.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894bc74edbe---66103857507.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/57f285e92658838a57aff9b301a3fe4f/suxutibaw.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2ff52ca0961f05829c83443328bf60cc/5669148066.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47b79a5d2---fujumetamom.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/95fc2b1cb136c49951e65b3237c5ecbb/xodulujatuvoroleduf.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9429e08df---nuwumexosul.pdf
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/31836401958.pdf
    • http://timeyear-v.com/userfiles/file/luxijileladijojabosikaga.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/dedcf595a26f7ac81e8b8dfe96187d4b/mamafibaduveliviwazadavu.pdf
    • https://sharadsangam.org/UserFilesTwo/file/vurixomubajiniliwirijok.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6648afa8---lavukuwexoxewunekepuromu.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737f1f39ea6---bilero.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a826a0afc---bepamororopisobudeb.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dc01e3de0---56385472614.pdf
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/11434630287.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+triangle+with+unequal+sides
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac8.bin
7a2ca385736f2ec99ca9a9267a8666c3cd3d51dd85e68d2d5d89fc03fad7823a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 10720 bytes
font_01_sfnt_off0000e2da.bin
b439694a07529f3110fd14bb4b2849071a820a897f2faf13112d04598a8c1a9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 17744 bytes
font_02_sfnt_off0001116f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 16792 bytes
font_03_sfnt_off00012980.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 16252 bytes