Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e31d6f17fce987…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 00:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9c8d878133dd8bd8120f5f9aee86e496 SHA-1: 02f87d8a0aa4b9531c93bd098f76feadc190eb13 SHA-256: 20e31d6f17fce9879dc92f4d6750c9d82c025dfb0dc7274e5465633987957ffb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, a common tactic for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, including those hosted on compromised CMS uploads, supports the classification as a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://ranchobg.com/img/file/36777960126.pdf In PDF document text
    • http://balade-pierry.fr/userfiles/file/pokuwovigifogapemenefu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137f26aad000---jirado.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/59646246925.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/fanelabatotagivi.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/bosidekoxujub.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/jexema.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613635c037904---17215977862.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210909160657_u112le.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/52713102210.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/22945789481.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/33119c6946a27b7b5f85a6fbfb9d6ae9/63520606219.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/9043184180.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/93837086149.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/tolife.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/razevixibiwepe.pdfIn PDF document text
    • https://matratva.in/userfiles/file/61974996042.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/vipezewuzodovebu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a2c0e19e---rerilitexowepesun.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feaa20a48b---fibufopapotujisibonifi.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/jixujufifufowugimukoz.pdfIn PDF document text
    • https://phm.vn/upload/files/5492787110.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/17824577411.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/janinedufotifuxukura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=premium+sms+access+android+10PDF 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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 10664 bytes
SHA-256: b9566a583094a3296a93889e11dd79fc257b5e8288bcb49837e486cba464c7ef
font_01_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 17844 bytes
SHA-256: c77f75302cabfea61120a3d400f851d35e97dbaa6c038183f47830bbb5ca8996
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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