Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75ccd68a70fbfcd…

MALICIOUS

PDF

140.1 KB Created: 2021-07-03 02:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e13b04ea358687ca69e3acc26a8e3907 SHA-1: e19f5988da88d85910ba653c443cd54ee22601ea SHA-256: b75ccd68a70fbfcddc1b24b2e6d4f9336c44e55f88c742cf61d23ae55bd60766
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 pointing to compromised WordPress sites and disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9187

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://crewmak.ru/uplcv?utm_term=help+oneself+to+meaning PDF link annotation
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/51c38e3a6c960e95afff64ccb195733e/40052715205.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607205314aaaf---92413227665.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/55744885981.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/pagegubabobulifu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f699fa9dbe---31659080511.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfa29680d1---95600660050.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160741359a1258---lepivufixemamukege.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2fc47175---bozezoguragemekobi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798e45c7349---fovufuvot.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/c77m8b6euhmgef2jngr0pot41g/6985739769.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gmtgqkpcfg4ghmppjiffclagst/busobebupopipapalaxa.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/a169ea7671da83facaca544e1e916c70/zasutisagi.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/tekamavadasafew.pdfIn PDF document text
    • http://mimpiindah1.com/contents//files/10083866230.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/kagefiximiselaj.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2552643fedf5deb662efa59dc730785b/ronulagitutigukoxazorax.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/cbd1bde08847f01c9c1f6d821332509d/lirusimuvigalawojapi.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/jojidekigu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160976cba7e76f---roteviviruxiw.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/fuxadavuwegodegaz.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a243aca84---26244739339.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/39ip09svajripc7bfs4nn51u0e/gomixokefilemiseva.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607d285de48aa---rukelipubipi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/18f08040e1ddadcd4256aef45ff65982/revaloneguvetej.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/5861159524.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00018024.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18024 31776 bytes
SHA-256: 12232f23572c670c35338eb370cabce184712861e7059dac713ed8b92ead45bc
font_00_sfnt_off00012c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14415 20444 bytes
SHA-256: fb7141f2c69baee383ad1403f37a634262299e94328b382e365ec28a320ae5ad
font_03_sfnt_off0001bb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB56 10592 bytes
SHA-256: c250c5e3ae6cacd2cf1da84af333e64a0e9a3840bcc7fda87cd490e51acaf26d
font_04_sfnt_off0001d378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D378 35708 bytes
SHA-256: 2cff70a3888f9088e6a690eb0a58706eea9324991914b3aee6c291de6b1e2f95

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