Malicious PDF — malware analysis report

Static analysis result for SHA-256 757d2aba93c428ee…

MALICIOUS

PDF

121.7 KB Created: 2021-08-18 21:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2aedc1de668e0503edd1dc1e049e4314 SHA-1: 169a5a7112422e0e0415bf0a4de92a0633077149 SHA-256: 757d2aba93c428ee2738572942a8d58556f7ce09f3159201a9cbe71f5c3be138
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing lure or a distribution point for malware. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests an attempt to obscure the true malicious destination. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://allycatering.com/userfiles/56118721799.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/36fd90135a0aa5e6bb506f94e4de265b/wowelenasiwejeni.pdfIn PDF document text
    • https://artbynela.com/uploads/file/zakutewefeli.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/tozevurem.pdfIn PDF document text
    • http://happy-land.hu/editor_up/nirex.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfed857ab4f---neruke.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/45694670282.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73723921f0---pibebosaxorilitumivukop.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba912ce64e5---18903255982.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbe29a7f0---dawukatevopap.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/18683159678.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/nokilegu.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/sabevozirarafofubovex.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/xesav.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890fab12ce9---boramurogegogabidosuxi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pozapevitaloze.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/nikegunadepililalasipuw.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34753860c---poturonijidevowo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011751225265.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ff87a8b54eeb2490847f9d299aea6995/15765324189.pdfIn PDF document text
    • https://marosme.ro/hirek/file/japonoz.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/wagefurejevidisejapusemug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=irs+schedule+c+form+1040+instructionsPDF 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_off00017a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19244 10884 bytes
SHA-256: 3c9270c8d98a4d96bc2a7c5b5e47f48a00a83deca2fceaa79d789cf5a13bf5a9
font_02_sfnt_off0001ab41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB41 17340 bytes
SHA-256: 64f74cb610d860e49ebaad9eb74fcb43b01cbf5515d96b0c25066d6a28fd1439

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