Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcdae22999c68b0…

MALICIOUS

PDF

109.7 KB Created: 2021-08-26 11:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e48515448a4102078923a2d80faa20ed SHA-1: 0eedccf24ccacec9c72396ac954e73541afdb8c6 SHA-256: 3fcdae22999c68b03c9388419a2316d124704011da53f350c643e4c13cdb9ae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://myphamasia.net/upload/files/kekedetuwasegujadomefew.pdf In PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/70662883889.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/dilam.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/sakovumevoxasoru.pdfIn PDF document text
    • http://freewest.at/basojag.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7iikkatbjlmgh8jn6s5u36md03/zovimebuzamoronu.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210723/0053414485.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/89550266941.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/83174978271.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/undvvns1f7gfrgv6cca8iu7nlq/72423588157.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c44666e9f47---bavodisagujopowodebufemo.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/jejixudoguwopesizo.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/68939362298.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/mazabaru.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/22466201592.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/810cc9a0da66e3f8e8ddf4ffbb57225e/35068763154.pdfIn PDF document text
    • http://plncse.hu/php_data/file/88786094120.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/i2m26gg24lkj64alf1fsb8nlk7/tunazavuza.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/35d7a2ef4503625a89a950a8b1e29b35/daseza.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xupewafifugewunirenu.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/xubegedexifoguda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=in+the+modern+quantum+mechanical+theory+of+the+atom+electron+movement+is+thought+to+be+aPDF 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_off00014836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14836 17068 bytes
SHA-256: 6b5b0a2048a3b10ce7d53bd3f91603dc96b1ad736e31ed053f67ef25ba32524e
font_01_sfnt_off000174b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CCC 11440 bytes
SHA-256: 8e6de845712e3d41744577a488804da4ed4d4ab0d4120434b987ac2aa9844844

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