Malicious PDF — malware analysis report

Static analysis result for SHA-256 8562eb88cd96b61e…

MALICIOUS

PDF

91.4 KB Created: 2021-09-21 02:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d76bdbb650d53799a724e4bac3d5315e SHA-1: d690be4899254e9109715e98d051c60fe51d79f6 SHA-256: 8562eb88cd96b61e99aa825bc745f5b50849275126137b05a0b30820b7119e84
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Heuristics identified it as a link farm hosted on compromised WordPress sites, with multiple URLs pointing to potentially malicious PDF files. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49839669e---1848437481.pdf In PDF document text
    • http://hanasushi6.com/uploads/files/zukigufo.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/wugivu.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/26049469356.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/pewuxozapudotixopubuk.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/73481837768.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3f3b614159527df3bfd12b577c647108/fumubaw.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/61998802462.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/bizogirugopa.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/46917585287.pdfIn PDF document text
    • https://stotex.rs/files/57361326718.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/63893022160.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/27098070941.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/18183923078.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109082257347761.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/91639897498.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/bigepowow.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4n3o9sscqsfj05livo6dg06ct4/fuxidisurexabobanulum.pdfIn PDF document text
    • http://sparkpro.lv/content/file/xuzivowitinoxuw.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/fafegagolosimo.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/10233544686.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/birexeweroloxutugugakoga.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/mavamuno.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/vugasupudopativurepedefar.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/3792610300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+transfer+data+from+an+iphone+to+an+androidPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/xubukamokoworof.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_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 18296 bytes
SHA-256: e27505401f3bd6d15b70009e22f8e469962c3aeaa53c7fe3cb16cbc19c3a7dc8
font_02_sfnt_off000146a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A1 10792 bytes
SHA-256: 7252e7a78d30feb0fc529d436e0a9b52cb2d27337be110697fd7c52f59b27126