Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43ef2c59aec18a1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 01:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61b506446021e8d2750d885be53bfb41 SHA-1: 354a7c5ce6902579d0235a8136a50b0dfd510714 SHA-256: f43ef2c59aec18a1c1e0fa643f935674205f513c769f60c0489c3bb7fb7ed84c
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish for credentials or deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 http://congluc.com/upload/files/kafikonofusosigu.pdf In PDF document text
    • https://pyccenter.com/images/Upload/file/firezifopapogeroseguw.pdfIn PDF document text
    • http://sinostandards.net/upload/files/gofekamezel.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/bovijezidakovomi.pdfIn PDF document text
    • http://nhabe.com.vn/ckfinder/userfiles/files/89206434367.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/398cd2cb6cbd93208602ca2af3365aa6/25772963455.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/bikus.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/puvetawunajid.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jugize.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136429508d78---xovalozo.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/wobexupidalunagujubazopej.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/71854820661.pdfIn PDF document text
    • http://fgosvo.ru/files/files/papiwigekagetegolino.pdfIn PDF document text
    • http://gibisch.info/files/files/darubawowoz.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/07a833ae9186f75d5fc163291ae07e63/kimorutoguxipegefax.pdfIn PDF document text
    • http://sjhtractor.com/d/files/44237473451.pdfIn PDF document text
    • https://media-get.com/userfiles/files/95030337557.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/4831766303.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/vupuzapem.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/74405881430.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161435fa166267---rulefegad.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+completely+format+android+phonePDF 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_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 17748 bytes
SHA-256: df301ff54b1f78a5f0faa4eb9f62373cde524baadc5c19bc945e8e3e86fbd87a
font_01_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 10908 bytes
SHA-256: a18726631df3332d45860962d72f4fe8bb7ac7cb62ee6f4ab98ce166a5ef0536
font_02_sfnt_off00012bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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