Malicious PDF — malware analysis report

Static analysis result for SHA-256 79047f3f487200c6…

MALICIOUS

PDF

87.8 KB Created: 2021-07-15 12:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4b9b6c664b7b664a7bd1883d968f042 SHA-1: a7f8855967663d9caa2f93873d63d088c991c239 SHA-256: 79047f3f487200c668dc83bed2ec8724e15b4b3ba0a67bf1cc94ec8d8126832a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=questions+based+on+carbon+and+its+compounds PDF link annotation
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a99e74664---jovugabamuroxemopavif.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/cru4mkpqtt0vu7bjeq4s4v60g4/12309053820.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/38788sj14qu2iqk89hiab1c0ep/lukotujenugesajujesen.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/sawekirowo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cid31co01a732qnu4k18t3ri0t/77255228300.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/4c4af50844a994baf7c63470348b0b5c/tasuxagarox.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/48qts6sl7pmh4fo9qrce2u2slm/78954045416.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/94377711586.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e949e8e8---nexuxekudepukisokinexu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea00bb0fb0---14582195121.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/65c9a454d4a7b6bb968ae0cd5eb8af20/93380473269.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/40622818733.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210624_24A53186A03DDB09.pdfIn PDF document text
    • http://anm-av.de/uploads/files/zorabovig.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/kevim.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4c9fefe77bb5a9009b2bc9c904986ae6/60005741203.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/94602357355.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/7d3d1dda3ce1241497b574f713d15afc/vazenubasofikajolaxem.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/52197385648.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/bipeme.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2d0ace0c6faf1da24bd9a8fac214b372/varonedivodekobemoku.pdfIn PDF document text
    • https://tangentemag.com/img/file/48791140407.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/pigeranefalapezu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/on33149asvl0c9p20u6tutu6b1/kogumef.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad53004ea97---276661873.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_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 17512 bytes
SHA-256: f3d67d38cc74f6d0b5844849f76f5663458eaaaa4b8887d11aa0210f2f87fb01
font_02_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 10928 bytes
SHA-256: d134b04c9578eded0e2c0e37807a65c5a74626d79b151923cea7483da2b3a278

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