Malicious PDF — malware analysis report

Static analysis result for SHA-256 34521fd8db2e3e9d…

MALICIOUS

PDF

88.6 KB Created: 2021-08-04 04:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66dd4135e1631c5b6203bd9bf6980f0c SHA-1: dfdd8becf5674e63947d276040c226501f7bfc64 SHA-256: 34521fd8db2e3e9dab809db58fb5a8ae8219cf49135b608aeb1a40be23622db7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS uploads and disposable domains. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://arlingtonhigh1959.com/clients/863184/File/fedugizogo.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071401373435.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/4233664819.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/fumefuvusazodobivemeli.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/fowedekilafe.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9303a29e8---vutijusuxewitomuduveziwe.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160753265e203f---junopikevobabib.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/h26jt3k7fif7akuodsm36dgj57/taxil.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/fewapesinifaguxolonen.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc1f650dfc---voturatepuweriremi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffe6f695de---55680568796.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/vewoxezekikiti.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/70327343610.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f3fa09a735fb24986011d1d62acc6afb/58274839870.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099085780384---foxisexe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc5d87741---91140689244.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/93b011792dffe09ecaa4218b5d62eac3/gunelugovi.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/20389232630.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/virok.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/178154d242eb4e02b17fd9056668a7b6/72299851607.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/38986063303.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f95ce27d---sizibuvalinisegiv.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/jimumufevuno.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7adae1dc6---wozujokudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+wireless+gaming+headset+2019+under+100PDF 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_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 17208 bytes
SHA-256: 673a5c8390226d0ef3b536116e24962aeb20ac835ab45d513adf630a11beecec
font_02_sfnt_off00013768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13768 11276 bytes
SHA-256: 465e68fe9f97f4507d899e0ef9b748a829366b517d275c171a746517f5985591