Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0655260adcf4a1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 05:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1839649a954f7dc9dc23f982b6bf789e SHA-1: 86959a9b2ae84db8af9aaac3aaf1e2d4bfd3e2b3 SHA-256: cb0655260adcf4a19a5b3dc7d89c33b52f4996155d079486bb0ea69503fd38d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or trojan distribution intent. The file's structure and URL patterns are consistent with a phishing campaign that uses a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=to+an+extent+in+a+sentence PDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed63a776d---29133240193.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161406818b0d7d---lizev.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/wekarurodareg.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091211442070554.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/pawowabewu.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/fubanalodawimowuxuseburi.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/nagobexasodaramazufado.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/50604802886.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/52856070764.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/80188553978.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144f4dcc6d72---48149076033.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/gumipe.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/jolufevarafu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/notijeduwe.pdfIn PDF document text
    • http://espwireless.net/uploads/file/45565473989.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/jedazalirovuj.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/varojeguvutikupinawagij.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/mupirijilorerafive.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/91481281260.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/sowurogesefonutinexugetuj.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/penijebuvufalikopevawif.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/80237816895.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/sirejarot.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8kp1mhqdshemkotek0sgs55ik2/50334426991.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/81770908417.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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 17776 bytes
SHA-256: 40bf0a929d727495cd2b5f8ae9a801189ef2c80739f753d997c6e1f055e7c9df
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 10144 bytes
SHA-256: 9e03342edf7cf92a35fd8ca50393d0060b418e9f3586d92d1ac80de7b145eafd
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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