Malicious PDF — malware analysis report

Static analysis result for SHA-256 d830070dd410647e…

MALICIOUS

PDF

101.5 KB Created: 2021-06-29 06:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2bf7ff40b19601a0dfb44ab138e08dbb SHA-1: 27912a5be65193e5e190bd988a8abd68de3b14ef SHA-256: d830070dd410647e83b172ef20ad586f10f9fca9d0321b65ff0ada5f57a8399f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://shian-jin.com/UserFiles/files/62927110225.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6293b7edc---8976740724.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a98f7d3cfeb---55441881640.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/05b6a69c926e9ff6c8d7bdd6519a7965/86600774930.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/60595025929.pdfIn PDF document text
    • https://ka-base.no/images_content/file/sigotelevanonaguz.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c527be4b89c---pakowuz.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f9998b278---zomifexafugudawew.pdfIn PDF document text
    • http://exlluprimebrochure.com/ckupload/files/gepadoxofijulikobosis.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/388d9a77165604ab8a90fb78c3fbf524/11526875740.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8da5676cd6e38922658f0b19c8baf998/wimobilapagavamenememon.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1477c4c996a060040a44da1cbdbb675f/94791735533.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/tomazoxoludisitoriwup.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a882f58bc7b---29204492462.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/9a4e808b5de720ba15689b9e104b8e92/fexalusakileziwuxaluwazax.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/kulebudurel.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f734ccf19---46769785492.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/74581624534.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fuvibabipinab.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/kamunarubu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed76857f819ca73b9bb9f44917eab369/sapukesasamejigoxe.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/dotoxavewoma.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/ditivejorumazenotexive.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/66126047202.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/danak.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c63eefde8a4---natomive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=is+garlic+a+fruit+or+vegetablePDF 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_off00012a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 17464 bytes
SHA-256: 8a6c6ec37d004af064f038f44cc8554587d4d8f650ee4de47c375dc7afefa908
font_01_sfnt_off000157d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FEB 10664 bytes
SHA-256: e334e4de032362d54f5a5ba6541eadd687461e6db0f6bc0854fe0bacb71525a1