Malicious PDF — malware analysis report

Static analysis result for SHA-256 42098ffa52d03ceb…

MALICIOUS

PDF

107.9 KB Created: 2021-07-04 21:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 136bbbda9d9d3f51391bee7ce8047341 SHA-1: aef5c17743ad4a887fb9a024d44f8c335b5e447b SHA-256: 42098ffa52d03ceb70b4dc553d2a04dae89b6b21f0d9112798f5bcd8bc514040
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc0b5edb2---fezumupibevomipas.pdf In PDF document text
    • http://grandrosso.com/js/upload/files/komijexoraverolene.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607690c427e5e---78617386745.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d7fbc1c5ff737cd8cffd159dfa00cc86/kuxaworodaxipaveloxuna.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/vuwolutaxurobabofi.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gukegaxogu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a775efcf---mumasameruseja.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/288r6rbkhi5kkhov6sfnqsn146/16657831064.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607db95b083be---12876282635.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/29275049956.pdfIn PDF document text
    • https://ms02bet.com/contents//files/bojodilulolemakojupun.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/8068595235.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/gavaxolo.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/16680488805.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/nimepokabaras.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160827d863812b---40652406316.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/pizafovajokewuzumaforirul.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/xolojevupiferogunofuz.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/detewezimoxego.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/93854011710.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/28841234666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=css+nth+of+classPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 10140 bytes
SHA-256: 68fc483c47f337ab44a65396ec85f2feb7df50aba541813f8507e2804336b520
font_01_sfnt_off0001426b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7C 16088 bytes
SHA-256: 0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf
font_03_sfnt_off00016fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FAB 18928 bytes
SHA-256: d5170c015c16205f0c7fce0d3ee65e652ef61aebd0f47f86bde74c82cf7a5a0f

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