Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42d16a36102bc08…

MALICIOUS

PDF

92.7 KB Created: 2021-06-29 13:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c263371fbf3c34e30df88ac07ed396b SHA-1: b0783b9c47701f36df41b7b819a558b1159a2e5f SHA-256: d42d16a36102bc08b62a5b8d41d7212724031784ac53fa24dfae7ec138c6b79b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://abugfreemind.com/userfiles/file/tetitekulakubebeximozoku.pdf
    • https://promise-land.com/upload/file/jexaxigebikuwitokigela.pdf
    • http://quatanggiabao.com/images/uploads/files/pumutaxisapu.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/33a9effe5c0daa3f1561411bc2fb078c/pebiwilefuto.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ea5739e80---mopegavijobexidetikorer.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1e2ee1290---sijisetaperut.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7322222fd---14918770410.pdf
    • https://healthmatters.me/userfiles/file/xisidagoz.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/boveziv.pdf
    • http://zabradli-znerezu.cz/userfiles/file/38289694685.pdf
    • http://zdrowejaja.com/Upload/file/87366601882.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfa8a9181e---kijiderubaxuraletuz.pdf
    • http://portaldo.eu/contenuti/upload/file/48062855204.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad2872436c---gemudajitunoxemukok.pdf
    • http://haai.org/upload/file/2295599052.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a5f00c464---24221766395.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/530f3abbdc722f4f32160878f8ad1157/zafuwakutopusorex.pdf
    • http://www.odnpoznan.pl/fotki/file/file/33748161182.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbff7c6d3---44948427173.pdf
    • http://mextro.de/upload/files/masexedamiduxedugise.pdf
    • http://rideco.hu/upload/file/67266508605.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f9f1269d---vuborigexoba.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/roxojijidujowinuwowi.pdf
    • https://vieclamday.com/userfiles/file/legina.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/8da35b5b96e11c45900f037abab94818/nulemugerarefegadememona.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=common+and+proper+nouns+worksheets+for+grade+3+with+answers
    • 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_off000105d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 16792 bytes
font_01_sfnt_off00011def.bin
62d0649a6a7ec3c20b3a401046f1392631f9dbfcd26941aae5dc05e1854b70bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 11380 bytes
font_02_sfnt_off00013877.bin
43d07561439b43989f5ab4ba628905730bb7c44b85d8a006e4b4034a542b9f5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13877 17024 bytes