Malicious PDF — malware analysis report

Static analysis result for SHA-256 2864c48247617273…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 17:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d648ca487b007f221d3b83c393b5bf49 SHA-1: 0f23864e002073fe92bbc41344b45f902d9eb777 SHA-256: 2864c48247617273d7833d419ac9b332dfb159e27bb16ed764c37f510a7e6826
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that functions as a link farm, directing users to various external PDF files hosted on potentially compromised websites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions and a password to decrypt a malicious archive, a common technique to bypass gateway security. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://toocapen.com/files/81181523105.pdf In PDF document text
    • http://jfk1969nola.com/clients/873000/File/11159050978.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b9e10124693ccd0c7206a8b463035a7c/85383027787.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/79076167065.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6e6c0da662eec9b2ab079a4535bc3124/79459071965.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/delujofikamisibisitanator.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/09/89125238709.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/15391834700.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/wupikiwede.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/2511813870.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/96795228781.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/38051616389.pdfIn PDF document text
    • http://dalaichau.com/files/sanopob.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210815011308.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/91073403114.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076349b85b4f---watisakewima.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/82471765293.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/41866322904.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/86029205419.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/33398810921.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/natotefinokipe.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc92278e0---58565413988.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/fuwexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rar+file+not+extractingPDF 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_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 17872 bytes
SHA-256: 9999c6c0bc8f8b1963a051abd2fe10f84ae8cf859ba5550ab66dd96b6cc5ca81
font_01_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 10488 bytes
SHA-256: 34701d638dd940c8874ecd27f428414e6e17a88109eca537bb363cbbe6dd24cd

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