Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dce3b1be4ec5a31…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 10:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb2e56bd29e7f454c2f29afcb7568c20 SHA-1: b815bcacd2ab43042bc7a3cecdc1e70d7e77baff SHA-256: 5dce3b1be4ec5a3158831d5fd245552b85856bf8629a173bd0a52dfd53bfad08
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://madeirashopping.com/userfiles/file/xokobumudazowivap.pdf In PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/gadidovulepameze.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/36800630282.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/kugiviredate.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109072136572926.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/36121251715.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/xoreroze.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/51439631668.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4be740e5---jagaxomijavomumizawewuxa.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/48997938350.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/depezixixurivoxovax.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/772211acd2a03d99cc1bc7b6ecb14997/givogov.pdfIn PDF document text
    • http://houselandia.ru/files/18334710025.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/97958393812.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/808af07cff5e1961949f12ae5fa36c1c/tonenezojebus.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/16555426192.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rubomaw.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/23193846279.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/82198467909.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/masapalewerusag.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/xumazudimubumupomevejofe.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/samomulijedonadofomusevi.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/7887006518.pdfIn PDF document text
    • https://sitarasign.ir/data/file/zavesimizokijakede.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/50345643099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+irishman+putlockerPDF 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_off0000c79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 10796 bytes
SHA-256: ced2e363be084697ce66de593d3d52fbb20a38aee54f7db6f77a35ea37100b39
font_01_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 17680 bytes
SHA-256: 10d6bef06ea4882ab7d806155b9ed168357b973a48d226f36fdbae21e73a52b7
font_02_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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