Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8119de7783a58c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 19:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 757937d7804298ae6949c1b838efde81 SHA-1: 4429659a402d85183c1936ebd64ffceaf8f84538 SHA-256: ac8119de7783a58c6b83dca054aafd0837501fab094f4e3544023eefc3c69683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1940672a---24007772731.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210508124630.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/mifomos.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/boxuxaw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c398272b3c1---dawifepeba.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ba062963d---rizamujizifexupuvepafido.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/81286ef98326d6a7c28a0bb0db4d1b85/perufenobefasuzepasike.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210716235438.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16070d55fef806---75038535259.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/18947801524.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wimofuripofuxaril.pdfIn PDF document text
    • https://network-italia.it/file/rutudokalisowanikosukifiz.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/49a58edeab516fb1c1372a1ed6f87d4f/dizoperefavimew.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2e7a50e4f8cfce221d200b8f14c19ba1/bixenapezu.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/74478289549.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96b8e5714---33855441241.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc91d95c9---vutuxifowomaga.pdfIn PDF document text
    • https://blugarden.eu/file/satar.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec51dc067---6531369795.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/kotile.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/cb252c971d372412eda15ced096c44bf/98356424515.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dcd73dbb7---3588670016.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/92434396351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=affinit%C3%A9+%C3%A9lectronique+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_off0000bf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF42 10664 bytes
SHA-256: c6563bc3efdaf3d449b29f879ae70fc668d9ecbfd3a77aae04647a2f32fe6d16
font_01_sfnt_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 20644 bytes
SHA-256: 6c6b980aeb0eb23584fa9494fe9d0541a63874ee39ca4a9903eb02653ac267ba
font_02_sfnt_off00010b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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