Malicious PDF — malware analysis report

Static analysis result for SHA-256 044a5b94e4ae856d…

MALICIOUS

PDF

122.0 KB Created: 2021-07-01 00:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09315bb372748bd5abda527d05ca50fe SHA-1: 7bca94842bef3a07b9758613f8f8e52ba78c67cf SHA-256: 044a5b94e4ae856d939ce69ffeaa71780475a37233a2e9f4efdadaf8994ae2d9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9267

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://senseoftourism.dk/userfiles/file/sezog.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083655869798---13018421355.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/kabuvowofajifimeradus.pdf
    • http://euro-ex.net/images/blog//file/3556326799.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9584cb45---jamili.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jl1fmur3j3hrcro08su281qdot/vatove.pdf
    • http://dush-kz.ru/uploads/fck/file/japunovuxepexaro.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/xituxakuf.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/kunadiperan.pdf
    • http://siembra.me/uploads/files/fobavifabititu.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/fpc9kebs5ctqm4r2c08fnli1o4/nufikakusunomozepux.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160936f8ba378b---pezusizoxaxiveguxi.pdf
    • https://hotellemaritime.com/hotel/upload/files/xapowububi.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/26790522175.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57525d5c6---81382699606.pdf
    • http://sendedianqi.com/upload_fck/file/2021-6-16/20210616121918576942.pdf
    • https://kcharp.com/ckfinder/userfiles/files/pedugewo.pdf
    • https://liniagdanskzydowo.pl/files/kanutozuja.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/3fktijtrmqqbq2va42gcm6d995/75479679502.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f5a309bf37955d229dad5a7afcd8be2d/85915675203.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607964311ad03---jolufatu.pdf
    • http://abwlanham.com/uploads/files/laxunifaje.pdf
    • http://fruhmann-elektrotechnik.at/sinugipiwutanupumani.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4qbac1pcc8ev5hv9npoaeghm9n/sisisufep.pdf
    • https://damiel.eu/userfiles/file/zuxutik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nor+in+tagalog
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bbe1fa100491bf68797739e2bb3f41d5/49332898647.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b43.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B43 16244 bytes
font_01_sfnt_off0001712f.bin
4697751af41cc604b1ccc1295ee026113a8e8773eccddac389f76a5edc3eb22f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1712F 9960 bytes
font_02_sfnt_off00018742.bin
f1a1d9b47b5eee2fade882070c3332651c81c60b8e604f9a9b670748226e5382
pdf-font-stream PDF embedded font (sfnt) at offset 0x18742 1908 bytes
font_03_sfnt_off0001900c.bin
b2f38cd44db4e1d00628e9f13f8557ee098f9b6cf0d19991def9d3d5e1b44e1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1900C 19344 bytes
font_04_sfnt_off0001c1ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1AC 16792 bytes