Malicious PDF — malware analysis report

Static analysis result for SHA-256 6503a6629e2127bd…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 04:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5fa5dc9094a77834a7e9dea3b4769e90 SHA-1: 6d080529dc4427533a9269c9694689c10e25f490 SHA-256: 6503a6629e2127bdf8d004b7de87a6267de050d94155cfb86c5b95198af5b6d4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=8+y+7 PDF link annotation
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/48526567390.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/70651738450.pdfIn PDF document text
    • https://asiapharma.la/files/files/pubazovozenufetuvefu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140794d79289---46063179421.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/17244801022.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/37195030798.pdfIn PDF document text
    • https://clinicscrm.com/img/files/banobex.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/zufaloxuzudiba.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/42a0b0754e4bdf23f40b06e69460144b/kevimijurixenome.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/89065392080.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///raxonovixen.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/86655203522.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/pofifawagexufinozimu.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/gugasojapepow.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/vobavewewe.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/21964830758.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/51777918318.pdfPDF link annotation
    • http://www.anjhimayath.com/upload/file/muziki.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202199128261655.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/fiwux.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb17a6ec3---jamudorad.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/69924493715.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_off0000bdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC1 21384 bytes
SHA-256: 1ce1c525b8fe1e04a9ce2527900d2e481388b688dca67b6ca6fff91a13f4a6c3
font_01_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 9352 bytes
SHA-256: 20c27630ced13a2e8380d02c3248337b2115165013a86d162a03113e5be1017f

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