Malicious PDF — malware analysis report

Static analysis result for SHA-256 6168dcc100b7ce6d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-20 02:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f8943688b7493c19fcadb06a8051380 SHA-1: 03aaf9d6b12f5c43f7c07fa8d81f6e9f9dcd61d5 SHA-256: 6168dcc100b7ce6dfc9c9714de0c981eb55a5d585e0579b7631bbe0b05eb6c6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by a machine learning classifier and ClamAV. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to open a password-protected archive, a common tactic to evade security controls. While no scripts were directly extracted, the presence of numerous links to PDF files hosted on various domains, some on compromised CMS upload storage, suggests a phishing or malware distribution campaign. The ML classifier's high confidence score further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://luatsubienhoa.com/upload/ck/files/memefoxugotomujuraw.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/78831437171.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/526fl00hia2n3fd9c2qd01aps5/mefezujufubodoraselek.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/82659018403.pdfIn PDF document text
    • http://fruitsad.pl/images/file/runabesegevu.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/kanix.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109191149047749.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/54199221843.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/wigexokixije.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hs44uievb0ldla33v6mjp41ua2/28124655960.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136b7ce1a6b2---33515842551.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/1567347599.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/16090272516.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/kolemirifarijovutose.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/92572847273.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f561a913f5757dfbd940ac225ba6b934/dedigodedidekosu.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/61110388856.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4d624cecd---tejurovalesekegiwekoniwov.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/vanedava.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/54554300349.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/tilanesopebokogiti.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/tilijoladivovinivabatejef.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/govuraxomoxotanepijerupar.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/xeriwetatuna.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/fizojomepebamagiwoxenusis.pdfIn PDF document text
    • http://stonebreaker.at/33497053165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ppsspp+tekken+tag+tournament+2PDF 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_off0000c6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A3 10772 bytes
SHA-256: 19598a85c756dc6b8ab4129213bde55a1600d14c3299cd06990ebaefaf34e681
font_01_sfnt_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 17004 bytes
SHA-256: 5ac7c50503cd0222e0e15d8b5be550f820b65a87c61bf2184e4aedb631f0c3f8

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