Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9add0f9f249655…

MALICIOUS

PDF

88.4 KB Created: 2021-07-16 23:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3b5dd39221b31e74ebde797f76c890f6 SHA-1: 3d5f5b2ed1b6a7e5d81f4a31769f7368a3d741ea SHA-256: 8d9add0f9f249655653771c72d1ddbd324a1be08a1249291c1cf6d648f992e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to exploit users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://communeouchamps.fr/userfiles/file/ravesawakitoliwa.pdf In PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/779c21f4d209a533d9b2850819d52a6d/33462141051.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/t5pvtmee7pb3c5af0d1i0pb6a3/55203462765.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/55924141403.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pevomavepimazemewebope.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16081602356bf2---mazadelerovojozi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68d489755---movajugokog.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6qk4gkb91k518di0ai05esb34j/bozaxegoturinezutuxadefi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/88130811568.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/93164015521.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/91ce59e3d09f0a38d463c53dad7033d5/pogirawonotugelakix.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/88031336317.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/fibibeta.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/tuxopilulilanaxizegiw.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/66f13dc09ce155215860d6bb5401ae34/fizuzem.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/637c7e409495c98f3f5e2a42e778ab9c/40212123174.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///10086251743.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/sofaruk.pdfIn PDF document text
    • https://ebooksweb.net/files/file/gujovixojiz.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/94305892488.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xogudenabeziluma.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a88cd483---78524101184.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/sanesutoramulaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=combustion+of+magnesium+in+oxygenPDF 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_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 17996 bytes
SHA-256: c8d7bf763544a4cff7879bdea2c3bab494b9ae2879c27c6078b9a50c53533eeb
font_01_sfnt_off0001231d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231D 10896 bytes
SHA-256: e0682444f3df4abc8ec26b1d20943b2eaac328dd9f90006b510d1653a4933fd8
font_02_sfnt_off00013c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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