Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd82fc503372efbf…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 04:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 005c07822219eab3cd910ab6b7dec264 SHA-1: e023b13f6fca934d2c5c6be3d13747199b91729d SHA-256: cd82fc503372efbf2669d540afc923ff82b43bb1990c0a06b80898f0ccf65a07
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, as indicated by the 'SE_CALLBACK_LURE' heuristic and the presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the structure suggests it may exploit PDF vulnerabilities or embed malicious JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bernendorf.ru/userfiles/file/40039725933.pdf In PDF document text
    • https://berettyotv.hu/userfiles/files/38547451609.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/12564265447.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/50769c67c8f16c4c614478482e0ce63e/nametinosefiwegajami.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/dulof.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/37136deb839d58bb90b0ee009be13158/6990590651.pdfIn PDF document text
    • http://iphysiology.ru/upload/4403339985.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/totu0pp2tforaa02ki05uehfo7/lusedatozudabenavo.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/sivaguxaj.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/kujuv.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/60332660362.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/96795994839.pdfIn PDF document text
    • http://vipdiler.ru/files/file/zaxusuledasaganuba.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/71147949867.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/kizixizagogud.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210920231546789969.pdfIn PDF document text
    • http://inprovitchile.com/ckfinder/userfiles/files/jovepesinumad.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/xusajetafukijibetax.pdfIn PDF document text
    • http://lex.tj/img/file/64530170540.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/fakanatowedirinenupokug.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/99217972996.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/71109831736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=things+from+letter+hPDF 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_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 10460 bytes
SHA-256: f5c838c45bc93ecd1e8d503e2308b48bb1f3cb7b63a3d758eda11af688e21225
font_02_sfnt_off00010f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 18108 bytes
SHA-256: aba05416d2c88be93b61d83dd22203ee62857f97b1a7c69e0e464782e9773fa8

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