Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6d23cc73337bbc…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 14:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c85f9c930ed9480619e2094426d9c70 SHA-1: c66f144fe4db00ad985a43eb3181a9d64b99eacb SHA-256: 4e6d23cc73337bbcb9e25b509d2cbae18d90635860ed625f03fff6ea8ca624f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URLs and the PDF structure points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9387c83eade6ad27c00116df34492486/33954708520.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16140380df1658---36546080875.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/begekovoxoxo.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/98877488735.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161325c03229a0---85090326980.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/natirikuweke.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/71298085901.pdfIn PDF document text
    • https://superchills.com/userfiles/file/48625601748.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2cd8879b44ad1854eaf9dec5652001bf/89390837005.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/65773574792.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/96060197987.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/43423343390.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hsk0f2bodapkh4l3o186q58r61/88240795477.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/16229409917.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613820f9daa3e---simalizuwasevokel.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/fovewaxod.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/vusozaz.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109080726161532.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/79680951772.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/kuxupotuk.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/jalumagiwatirut.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/49298165337.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/11020543801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=total+sms+control+apk+free+downloadPDF 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_off0000cc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 20364 bytes
SHA-256: 281b5573feb48557199a901b137b67185ad37c60fcd449a1125f8179a9ea2060
font_01_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 10832 bytes
SHA-256: 7a2c898d7de9806714104f4786a6960bed5bc1bf8ae4544bcc2f921d240f6511

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