Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d11bd88103ff5d…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 13:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4bb59efd21596f55d24634006223179 SHA-1: 6c9f883be2b682066e8b083804647ea5f6a0d726 SHA-256: e2d11bd88103ff5dda6cbbc125e3b1babfbd2b74ec47fb28bc70446b618742c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to various domains, many of which are flagged as link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://langeline.com/ckeditor/upload/files/83858440358.pdf In PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/wodewolodij.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/4187195845.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff925c610---84516670647.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/62512311135.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109050327369902.pdfIn PDF document text
    • http://perfectsextherapy.com/public_html/userfiles/file/56206544104.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/vokewosux.pdfIn PDF document text
    • https://congchung7.vn/upload/file/95311443431.pdfIn PDF document text
    • http://dentherapia.hu/files/file/45117068323.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/13671794071.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/60121233630.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aec9beb91a---76130367005.pdfIn PDF document text
    • https://motoralbini.it/files/file/romewiwufoxujenokeguze.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/18896495668.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/71184314227.pdfIn PDF document text
    • http://web5gstore.com/Files/files/zatutidawigir.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341963e1267---mufekoweza.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/sawekozusesegavuv.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/52012689427.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/55946680574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=iphone+11+pro+bd+price+2020PDF 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_off0000af76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 10524 bytes
SHA-256: b4ca70f22e695efe5ab1d82e9964f00d5b14f331bfb546537e2ca8109f2d2e79
font_02_sfnt_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 19836 bytes
SHA-256: efe132d2b46a66f83d27d7c400dc5adfa5774c0ca15798dca1e45d0334196321