Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c0d8ed2a303c2d…

MALICIOUS

PDF

74.9 KB Created: 2021-10-20 05:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b5abd51c9e7d618b4b28e6b47fc252a SHA-1: 417c026ea59640a9d3da6dde4ac3992ac4be4ebc SHA-256: f3c0d8ed2a303c2d19f1a5e612eea21d95415ca574ac59c56acd6aae8194d797
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on compromised or disposable domains. The presence of multiple PDF link farm heuristics and external URI firings strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://avrig35.ro/uploads/fck_editor/file/bifelado.pdf In PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/gaverurexi.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/vikuna.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616559565bf07---88716565727.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/35391239679.pdfIn PDF document text
    • http://divelife.kz/files/file/42176348449.pdfIn PDF document text
    • http://hopkim.vn/upload/files/lizis.pdfIn PDF document text
    • http://mobitransjogja.com/files/94633013746.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/wedekokowikes.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614395a987706---sovubiwoduvonoxikas.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/walowutowiwuxujitekejet.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/98046585821.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1cd6a28d55e62a04e065e64603ec9384/86653428782.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/46403130836.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/9838249656.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/79231690000.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/fefutubasuxibirorakefip.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/22880888287.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/memun.pdfIn PDF document text
    • http://fgosvo.ru/files/files/45665131440.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/xenogipowulorosotuwu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/37e3faae0236055b5cc8357ef7f390f8/pebilotopasarawujuka.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/ralesozubelekisis.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16162fe95e2fbd---33221993031.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4l857ocgm4n2bbqvmg97edm2c1/60450330632.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=how+to+make+shaadi+biodataPDF 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_off0000c2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 10572 bytes
SHA-256: d0237d111f19f449b37521f80915ba4b8bc3593844e9d4079390bd5d0ddc8c8f
font_01_sfnt_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 16800 bytes
SHA-256: 6874f8c86fcc246c8c1347b4ef35bfc009d69ee923c24de85da333e1e2006191
font_02_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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