Malicious PDF — malware analysis report

Static analysis result for SHA-256 e221b87aa3c2b766…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 18:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86a8f08576ea87e56286e367f4674f6a SHA-1: f959e9d9fb7610d0b2e7e84286da555ad0d29d7b SHA-256: e221b87aa3c2b7668c93deb7312c0c2fedff4dfff4756c658efe3e501846fd77
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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://www.cylinder96.ru/admin/ckfinder/userfiles/files/1913047544.pdf In PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/69051298675.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/42982079436.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7dcbfbc10053de1fbf590d47acef0c5c/juzawakeginajevedol.pdfIn PDF document text
    • http://theponghop.com/upload/files/36164728402.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/srmstg639mn6kqsahrab1gshpt/ranuvonovuvim.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/vemamajevur.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/86719201938.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/xoxisaripuxo.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/41492550891.pdfIn PDF document text
    • http://cityfate.com/files/files/tulatutemazivijedotibus.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090203532247.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/lutetofokawizujesijuw.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/rufafiravobaxi.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/94206946742.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/bivijuwudevatujev.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/58768166779.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/41945486046.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/kobesubaleja.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5eb6245a---senasemizigodasutoted.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613472e8e1ce6---71359636376.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/75850080463.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/torod.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/92031125486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=german+driving+license+theory+book+english+pdfPDF 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_off0000cb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB26 18052 bytes
SHA-256: 23686c069bc051b9eac1b6ee26f4b44fcaac479880d2764e6e377e04d52f64e1
font_01_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 11516 bytes
SHA-256: eb3a8a681a99b08a4aebb1a5228c79ebf9d6deee33d37aafd26ee451ea76bbf9
font_02_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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