Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e703b234aa95c5…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 04:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cbd39805bdec1d01a4868bed43e432b SHA-1: fc23a0932cf3a518d65c5df543be5dfa170dce5d SHA-256: 38e703b234aa95c5635e62c6b8d1cfb651499204f22f924a4b3e77f8fc97eb81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The PDF also contains numerous links pointing to potentially compromised domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://andrejc.si/files/file/tujutijomevujiwela.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078324d49e16---55098796767.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/21077615589.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c422b922169---72223018874.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/36071070119.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fbc5298cfee4d1b0e6d48935834c11c4/ponotijuz.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074602d7e6ca---vadofavubevonukote.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/didimugozili.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jogesev.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/29702590911.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/bejogapapuregevadepunipim.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/zunejemunonow.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/fazalopiraseb.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/40e6d1c47f0b49152730b9b7a21e4d47/lupiren.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160942017711d0---87844054808.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/pegefisijudidagada.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fonlhsuehg6a4oqgee8mjjij4d/voxisexixetimomuxisukaral.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/77658510201.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/piwugefi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/76e8e96c804718be4fe75bf4d27ae9a3/gozunafosula.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/c55dtrk5ktfd4aert7u2d9s2no/89304713482.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609378ca4fdaf---satelizawok.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/8120773391.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/k51tiiqaovicdbuq5b716lftkm/niledonuwakojuliko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=elton+mayo+human+relations+theory+pdfPDF 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_off0000b9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DC 15480 bytes
SHA-256: 16f1e2270864f8137af326f7452025cc894a0974807d94f355de3eb83c23900d
font_01_sfnt_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 10960 bytes
SHA-256: 35c3dd21b4e1be012350bbaaa6369d6a55447269e8606ba5f7bb6d16da821b20
font_02_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1