Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5905ead89cb96d4…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 07:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a6bde516bbf4fcbfcdd65c906458c50b SHA-1: d573b2085c573ec2d3a806217aa6be2e60cb268e SHA-256: f5905ead89cb96d4b858e533b949e5e2fbc6b6f62362611d3a12fbf5b1d09efd
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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://catamma.ru/uplcv?utm_term=free+online+plagiarism+checker+with+percentage+pdf PDF link annotation
    • http://koszyczarek.pl/userfiles/file/lakimeratokojali.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/jepomudazedu.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/fojexipolofajaf.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cd080f1a56a---kubaxuzow.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/xenujomugevujulevuduvud.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/tifizokakag.pdfIn PDF document text
    • https://kede.org/userfiles/file/pukoterawuvek.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/75520599089.pdfIn PDF document text
    • https://emmaushuis.org/pages/13884744785.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9e5d0a1cfc43a0e3298b45cd58077379/lufutufud.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/84155319612.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/sivijupalifesebigapofad.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/toruloner.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/91566105800.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/85726915226.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/72809856873.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d0130e59---48810405362.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/mnb2n5jiqpc51e3k7b5nfo7h06/vireroxonovifotu.pdfIn PDF document text
    • https://maviet.vn/upload/files/zebokafukizobinikupe.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cf66f0cd4c1---66246601511.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/jimedarewubobetewafexe.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/21831418016.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e32c151b03acb43d174ba18b4b16f2fc/mosiburusij.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/40382746691.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ff3815fc---36073025441.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/99595640549.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_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 18176 bytes
SHA-256: 996e738799868e81875c9235d4f0eba3c132f7572208701b2d9a2278b32872ba
font_02_sfnt_off0001301a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301A 11220 bytes
SHA-256: 7b047781d752c34b86edfac5c79e235e447bb6ce03c73d22550d4c3f981ed296

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