Malicious PDF — malware analysis report

Static analysis result for SHA-256 0886ac3e0c9b2359…

MALICIOUS

PDF

77.2 KB Created: 2021-07-24 23:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8a0f7087d95f83fbffe4bd268214b0a SHA-1: 66edfe925a59dadd7c4263397556d7b89a457063 SHA-256: 0886ac3e0c9b23593937e2f66aaf111a947a1d61b9dd540e65b833788dc4a75c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with multiple URLs pointing to potentially compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://briljant-maleri.se/UserFiles/files/nijaxifipedovuturav.pdf
    • https://loyallcanada.ca/editor_files/file/mopur.pdf
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/46024694036.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae94042be---bakevabaxurupudotokizak.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/79a5ad3b8628c73bd7f1b23ec3db6d8b/nevunulosujurasavedutodos.pdf
    • https://tcremich.lu/files/files/sejutelomefew.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf48942ac9---mefat.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607861b0227b8---20287677281.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf8de8194---18571569431.pdf
    • https://irastuff.com/admin/ckfinder/uploads/files/70528637686.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9baefcf029a2a67086409442f89d836d/pezidevafujojatusoguwug.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f75a028f023e35c48f4529519b470cfc/25236033017.pdf
    • http://studiosimonepantaleo.it/userfiles/files/mikodizudedef.pdf
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kevudiz.pdf
    • http://theheavent.com/userfiles/files/46854122502.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160751e5d7b53d---rabixemin.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f03ec10f439---gozilovazo.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/rof345s6r6m68ppkqll900pgbh/22181713482.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2d1fa8f610cf8ffce1179bc859fd2177/budoxazo.pdf
    • http://4bx.pl/public/file/16304948647.pdf
    • http://sunjewelsonline.com/userfiles/file/lanuvudepunufulu.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/varovinojetebetavubi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=apostila+de+84+exercicios+resolvidos+de+analise+combinat%C3%B3ria+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c55c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC55C 16792 bytes
font_01_sfnt_off0000dd73.bin
b8c1d7c1c586102bfaedd0516415351f0c42670ac11e1214665385f98d03001f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 11492 bytes
font_02_sfnt_off0000f848.bin
aa394c8070250c4eda6e2cb1b8e25e4b88f4fb4a9227e7b7084c92c02648db3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 17488 bytes