Malicious PDF — malware analysis report

Static analysis result for SHA-256 664e21c13a26f184…

MALICIOUS

PDF

77.3 KB Created: 2021-09-20 09:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50c5ec7cd6c02b5991dafd17c7b60d1e SHA-1: c5176843d77f7efd7948057ddbb2f09a5e0bee55 SHA-256: 664e21c13a26f18474f0b3c1b0f14f28105c9fdbe68b2825bf29813f941309ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tianlanlawyer.com/filespath/files/20210905005314.pdf
    • http://www.thaiboat.net/image/upload/File/jipeve.pdf
    • http://7m-shop.com/userfiles/file/58028415472.pdf
    • http://pasaru.com/upload/files/7445715303.pdf
    • http://businessvaluationapp.com/fck_files/file/kuvefisozululawif.pdf
    • http://illinoislivestock.org/userfiles/file/86505520947.pdf
    • http://parvazyab.net/basefile/api203/files/84325821722.pdf
    • http://hepiran.com/cache/fck_files/file/tovifalogirunolefupikete.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/finuvopalalikedoxa.pdf
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/keradal.pdf
    • http://musclecar-taps.com/js/upload/files/4252881599.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/bejuropogedob.pdf
    • http://nsfeed.com/_UploadFile/Images/file/mizaxebum.pdf
    • https://heureka-cz.eu/files/falomuwelubif.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4230a0578---62230414470.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146c41a984ea---72521801772.pdf
    • http://zovsh.com/Uploadfiles/files/47806348190.pdf
    • http://manuale.aziendasulweb.it/userfiles/files/badalemejif.pdf
    • https://doosradashak.in/ci/userfiles/files/kunipebavapes.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/24955649809.pdf
    • http://elskup.pl/images/assets/file/zakukomisetojagomekado.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161403b07cfb1a---vapavebotakinokexug.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350db04af2c---paxuras.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=vpn+for+kodi+firestick
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC42 16792 bytes
font_01_sfnt_off0000e454.bin
87e809db809ec4c4086e34d084c4952ced6e2fd982294b7049f6ced0dbb4ff38
pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 16836 bytes
font_02_sfnt_off00010fb9.bin
8e9baee86ba44e5073242e5b6eaa3ff585632426e5764715e78dc46eb58609cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 10464 bytes