Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b9d83a4a8e9546…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 09:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1f8d1fa27f4a8300ab0285bf33fb7fb SHA-1: 33151292c2bb0c6c30a20db5b1134568038f36d3 SHA-256: 51b9d83a4a8e95469cb26725de2d0aec22bd5c36633761235c9e623c5f0c3844
204 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one pointing to a raw IP address and others hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure and ML classification further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://istanajpdua.com/contents/files/30270737062.pdf In PDF document text
    • http://damnoen.com/ckfinder/pho/files/39652212972.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/vofulo.pdfIn PDF document text
    • https://bloomeng.com/uploads/tunujejonofunonitigitiku.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d27a4832b---jafulox.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/xiperatugititoko.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/kesugak.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/lovaxovavarixe.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/duripunerirituk.pdfPDF link annotation
    • http://wxeina.com/userfiles/files/69748271692.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/vadabafiturumip.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/samotedixalakupub.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9241410d5---wizamikabekavuzagibuvu.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/87271722363.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d53897191---63504065499.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/41388076762.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/telobax.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/paxikojafewiwaxavulepo.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/sanonogatuzuseguzar.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/kiwagojerodibifefogegul.pdfIn PDF document text
    • http://st03.it/userfiles/files/40239349297.pdfIn PDF document text
    • http://okvin.org/userfiles/file/nogutemakolibubiga.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/mefetakata.pdfIn PDF document text
    • https://renault-service.com/userfiles/rapotisofixif.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/36323555146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=boom+karts+mod+apkPDF 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_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 18564 bytes
SHA-256: f42b5dd0a636138c95d30253d055f1ae5e738b827b438940f4d298ffd479c76b
font_01_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 10324 bytes
SHA-256: 35887efa1870b707dc9bae8ab1e54a3c2af2be99ac1295eac11b514dc5455b5b
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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