Malicious PDF — malware analysis report

Static analysis result for SHA-256 263ad837b81d4f73…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 14:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77b1841f8d51008dc35a3e49e93110f7 SHA-1: 61ae980152cc63aac3306f18a595aca74f822a1e SHA-256: 263ad837b81d4f732c3db5e496d5cffba65a62c5f98a3dbfa9e4be97aaf935f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4oksq2o46h64odrbtneglgbcog/kuzeroraz.pdf In PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/84583710622.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cac146754---bexuzenaperasazomekusojak.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5235a505b---tikedonu.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/dogoluriroxejurujefitif.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece52e05a4---58997404313.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nk4bsmrjfbbph03b84cspb3m16/pugewusedutolunupoj.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/nadazagomaral.pdfIn PDF document text
    • https://ysh.my/userfiles/file/20787821152.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/31841079991.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16107e0772fda9---jujutogezutunoninakibuti.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097740613f8d---pumusitefopinerogor.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0b7d675b2c8a7bdf8908774585074c31/4121178139.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/luleraranejafa.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ed0c069459b89582d3b276f62b4cc19b/gujarikimomenetug.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/33724855801.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/50113597380.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/26220953858.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7709c8d475---dulug.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/vitefejumadekovabuzelona.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/wepijopirosumap.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/14854317649.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/milul.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/59627344530.pdfIn PDF document text
    • http://freewest.at/4114065421.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-31/20210731135230197608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ghost+town+shiny+toy+gunsPDF 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_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 19304 bytes
SHA-256: 9199b7d00b02c5dd03ef62cdb5b8742bde7016c480fde0e64b2a3b716a0784b3
font_01_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 10284 bytes
SHA-256: 0f7636b63f08c881dc63ebe5b28ade4bd721815d67abb83b641f89bb417cacb1
font_02_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.