Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1221bc8874fe099…

MALICIOUS

PDF

97.2 KB Created: 2021-07-05 03:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0d672482c5c2d575b6de0296dc326942 SHA-1: 447c4781cad67e14b8f3dde0f433c7dcb5eed743 SHA-256: c1221bc8874fe099e9e139ecd0f672b82cd8af96ab4d4906d1abaabe2ae86b85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, potentially using embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://archism.ru/uplcv?utm_term=compatible+moon+signs PDF link annotation
    • http://ytovietnam.net/ckfinder/userfiles/files/deditovazilorebimudifoko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a556ee5b0f---68262519171.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/eajmchso711tcdevmi9gpbn5o1/gujomamufupalepoja.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/13088023695.pdfIn PDF document text
    • https://85097781.com/upload/files/maxuxekopuxepa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a11dbb44395c210418ed1e0230472872/78019886880.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/fewuninafowajiruk.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/68487caac23ab3b1be1b403b9421c1b2/98672285291.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/93867273962.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2205c2ab36a3ab971822a44ab1423a07/19298172791.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608283c193bd5---94532834347.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083336930635---8951526117.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/norivezuregujozevarak.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/77f4d1431561d20fe7b6f8346fcb6b67/matovejozag.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/7342038441.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e4ea73e91---40346515118.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ca8380fc---58933069161.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/38279082165.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/sorududatizumikazabategu.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/27856566094.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/33030369786.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6915f177ca---29932798563.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/wixebilapibeleravoxeni.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e51473f3---74445363967.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/40793297609.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/16876610071.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35cd66538---kasezel.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/nupagubom.pdfIn PDF document text
    • 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_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 17248 bytes
SHA-256: 92c36f686667776d093d9eb1351801f43b87a0d21b848930c705d49b49148d10
font_02_sfnt_off000148c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C7 10664 bytes
SHA-256: b04fbfe8b2517815b5606bd43662a5343d0937c74896e87ba4e77ec1ff9ae52d
font_03_sfnt_off000160f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F4 16224 bytes
SHA-256: dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d

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