Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb49f7e877ccab7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 22:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6b5f76da1ab3186f2a7ec89fae897af2 SHA-1: cd6212a08f833351058759f6c34f9ce6822cc282 SHA-256: 1eb49f7e877ccab7c677b8238dd782df2abf215aa91c0cbaaa3bb1bcdcd251bc
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, many of which host other PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://soosekszer.hu/upload/files/2101681172.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3a427c5b---zorezonazovewubam.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/67663607139.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/duwexivivateke.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hphf1j1dssmavq4a003prtatf1/muguxesoki.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/70a9040c751e4adeaa42ef30242c10ba/59794693915.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/93728331058.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/givosi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082998b3b69e---99686068923.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/welofudiva.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/91417254428.pdfIn PDF document text
    • https://hssanesteban.cl/files/87828428899.pdfIn PDF document text
    • http://linker-apps.com/files/wunodosiwunivefivogeluj.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/85586903815.pdfIn PDF document text
    • http://fitviewer.biz/files/file/17701884411.pdfIn PDF document text
    • http://midel.me/userfiles/file/86756627219.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/97803897105.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8ebe0e486adce5127cbc3210595f5adf/vexonorekulib.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/38130852951.pdfIn PDF document text
    • http://hogan1973.com/clients/d/d4/d4eda5e2427b34f3a15374adde9a77da/File/rozetojiverofisutopis.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/63113649294.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/jezomerideletab.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611ccc0324770---moxuvevododufejudus.pdfIn PDF document text
    • http://npas.ru/pic/file/1492950503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=comparative+advantage+practice+problems+worksheetPDF 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_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 18076 bytes
SHA-256: 1087993bd5e01cd100631ba04c7db4d2447bb8eee980f226e651e7e4b8041461
font_01_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 11376 bytes
SHA-256: e693612b8f0b78a8d14e72d96f49c8c23555bde530d9f90d18017f73a55221a1
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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