Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e6d76e81cf069e…

MALICIOUS

PDF

81.5 KB Created: 2021-08-20 19:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 903c8998370cb074ee5097205a0b6e16 SHA-1: b3f970e30b9791183dcd6fcee700db4e4b3bd4fe SHA-256: a9e6d76e81cf069e05b4d9c47248a4905140a2e4f46c4bfe7ab0b7dd9b2bad11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://catamma.ru/uplcv?utm_term=youtube+offline+app+download+for+android+mobile
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a4e7db81---29045720609.pdf
    • http://reikihaus.com/clients/75291/File/fobedulotarewebodovu.pdf
    • http://elementsgogreen.com/userfiles/file/zerevirinelavogal.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113d494b1bcd---96194028118.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099df240cdd8---xowubisodarivoxet.pdf
    • https://szaktel.hu/uploads/file/59701818288.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/i7iop6grso6qttd4fgc46868t1/bajipod.pdf
    • http://0vote.com/ckfinder/files/rozofasiwovizewi.pdf
    • http://novafish.it/userfiles/files/11816405295.pdf
    • http://kamerton.nl/clientfiles/vikeganutosonoparewa.pdf
    • https://camping-du-lac-dijon.com/fichiers/38993633654.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2pqv264t02parve26at7058pg7/wuvesuzaru.pdf
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/49539144404.pdf
    • http://ackerviewguesthouse.com/userfiles/file/79041308761.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/60621102488.pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/c5bimjos63ejqktln2ok8o72pg/rosodidabesipar.pdf
    • https://mmszke.hu/files/file/joronumujazevigiz.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d58dfeb5adf186bb861a85a6b33dfbb0/91475764352.pdf
    • http://vhshf.de/File/parowazukenebasatuxujuvux.pdf
    • https://adium.ru/userfiles/file/rinikakopokol.pdf
    • http://chronocertif.com/userfiles/file/17460145976.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609daba862ba6---besupaxalovoxuzevawukixo.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/17628379126.pdf
    • http://domingo.hu/ckfinder/userfiles/files/paduxax.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_off0000de9c.bin
7fb3adc4c04ecd5573752f56cc4973f02ea5fcf8ff3b735ee89ad931843b8da6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 10800 bytes
font_01_sfnt_off0000f741.bin
74ad2e676072e04df9f7c5e580bd6fb98948c692920d0caf885e9ad3c5c1589a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 15812 bytes
font_02_sfnt_off00011ffa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 16792 bytes