Malicious PDF — malware analysis report

Static analysis result for SHA-256 a184ae40448efa9f…

MALICIOUS

PDF

106.8 KB Created: 2021-07-06 19:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd2673429fcc6c8a8f15fef4cbfedece SHA-1: e1e768d1f49adc137a38008592740a1a239cba62 SHA-256: a184ae40448efa9fac54aa1fbaf843e8f0451e6a2a7cf967e32f1a1e41e6c3c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://inwebjor.ru/uplcv?utm_term=classifying+matter+worksheet+answers PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d594e2470---32561971413.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609531930e6be---kabuj.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e37e5f151b277d3ab2232c2106eea0f/lumalakapapidegur.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/3c39s949melqgpkl837hq2m1ds/85600532715.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/98355372179.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081e546d49cc---virafikazan.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/5915784081.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/pebinisiwe.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3540b58da---73520168672.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/67883844714.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/o8tf2f0hbkbihm2mbfr58c62t6/wuwerifojavizepevu.pdfIn PDF document text
    • http://nktrading.qa/file/files/kumeligejuka.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7742ce6abc---87713508225.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e732630c4fc04fa36a681efb8892820/78259037113.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/65907129997.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/rulijedirurinumarixu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792d7a63c0e---13367254730.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c58a2ef4c13b8faa8b6074540cb0d8fa/xerixazatejazimotewatazor.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/48a70bebcf56b12959cff38a60278bf9/ludokefinapeliwo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c128cce9378---lepamomabetigamonolirov.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/jatilotaz.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d372b519---doloze.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/50b389e4becf01f3aaacb16b17d6b930/88909031733.pdfIn PDF document text
    • https://negaratoto.com/contents//files/winonekamupilaj.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210703_0E72AB9AB38DCC5A.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8crnes7qdg29qgfubi9hkmri9v/17739974729.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 10984 bytes
SHA-256: f6d46ad2fed4ab5709365ade80d4fbc7b483f44259bba28b3200f308b7547721
font_01_sfnt_off000152ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EF 18200 bytes
SHA-256: b2cce672a248a6125e42e09fd48b79afa022026367523c6388c8a0cd5f15a0c9
font_02_sfnt_off000183af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1