Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1d7dc4bfa28acd…

MALICIOUS

PDF

90.5 KB Created: 2021-08-01 15:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e2c30cb332f82de19b61add363f66ecf SHA-1: a6b8fc58d6a7755e50ccbbc69e86c10cbcbffe11 SHA-256: 3f1d7dc4bfa28acdfcc88461c713bf22bef262679d66194d4c669d0dda36a512
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The presence of numerous external URIs, many hosted on compromised or disposable domains, suggests a link farm designed to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the phishing or scam lure, indicating a deceptive call-to-action within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=free+cash+envelope+system+template PDF link annotation
    • http://ipceurope.eu/assets/file/vujidejofi.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/21450073627.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/pprb6kq2lmrb4volpp925h7okm/laxenuresalobesipab.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/nofisupe.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/62030951541.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/c608d2064c9f67ff048d453cb61eae82/91440550583.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210708_123047.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/40270197037.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/gotubegutuludafomakudur.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/68174295374.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160840990309a8---dumixoxozivufu.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ukka0au1bes2101q3mcfjc36sv/14823765002.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/2296090198.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c7ee937e5---87505324971.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/zovajujanibegilubizoxi.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/pivuwezinubefemugeraw.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f727a2dd86---57895126015.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/fudabixu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b59b6f32---nuzexonelukisa.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/60594809073.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc7934bf9---81423247534.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d82aa1c29---53894493323.pdfIn PDF document text
    • http://novichiha.ru/pic/file/vabuseli.pdfIn PDF document text
    • https://le27.fr/docs/file/siwoxifofelogosejeku.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bba3d94664ba827d8abf0075506a2050/98151961241.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 10704 bytes
SHA-256: df35e3df8cbc8f1a82a61baa491ca425e6aa099d789c4d077742239f43a72e5d
font_01_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D75 17240 bytes
SHA-256: cbb3fc49fe1f50d9e0a594e740d95344aae1bf1972d09f48f337b3fd4dc8a475

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