Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e635fdbc2b2dec…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 19:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5786827bcc5a4e9f2975f40e41d488d5 SHA-1: 2a51553945cd98d3e41ce56f19299b39949c0555 SHA-256: d3e635fdbc2b2dec27be8cc2871d7ca8169e4da4f836a219deae84ded93f68ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d30cbfe5---96446237760.pdf In PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/bazepotaretitisulukefemil.pdfIn PDF document text
    • https://kapefashion.com/files/files/nopil.pdfIn PDF document text
    • https://anakmeong.com/contents/files/gulizazuwezugudikunal.pdfIn PDF document text
    • http://generaldistco.com/images/file/46591668010.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/18546584618.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/3332359685.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/zenigumulo.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/93873454626.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/n45g4a4hr5v1qbq2b6spduv68m/82754815653.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/mazofesolosipabokatijizod.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/mowimaboxukazolofexinude.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/5286802485.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db7ec7fdce---13205484922.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/33472060694.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/polixododudaza.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/topakam.pdfIn PDF document text
    • http://casauthienan.com/fckeditor/editor/filemanager/connectors/php/temp/file/60279684936.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/35292222440.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/rekubikejigukuke.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/66915923493.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/gufemineguno.pdfIn PDF document text
    • http://decorstore.eu/upload/file/xizoxokuzekekozidazor.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/51781367261.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/zemanuwuge.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/97678554529.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ktt055lph4dqj4bleb4ft2dfm7/ramugoxopijamitiwupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+pokemon+roms+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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 10500 bytes
SHA-256: 25e437a249213ff69717b1191dad97f87a993bd1461efbac817507e4e98086db
font_02_sfnt_off000118cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CC 21056 bytes
SHA-256: af53ecb4301172beae12972caa9da81141fc0e499e67ecf15c1ee8c6d5a1a58f