Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c75f6fc764b8d2…

MALICIOUS

PDF

81.5 KB Created: 2021-10-04 18:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6d94d611586f8f684adb0821d4444a5 SHA-1: 4ef1646a2a472a66b1f5d683a496dab1a3e18835 SHA-256: 84c75f6fc764b8d250492345069780421cf85256ce535a4d8ba1f0d5f6a880d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=download+game+screen+recorder
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/92609986361.pdf
    • http://tsmsaldature.it/userfiles/files/17400695175.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210906222516.pdf
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/gedegidarapofefapugaras.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/343u8mgqtidg7tuc3up0la8lh5/81095229747.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c21b7aa26---87402122584.pdf
    • http://katour.ru/admin/ckfinder/userfiles/files/kilojikemumexanuviku.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/46124997455.pdf
    • http://masonhn.com/d/files/60008860808.pdf
    • https://nedimgame.com/calisma2/files/uploads/kobofuzakagekesidam.pdf
    • http://elosc.com/upFile/file///ITX202109241836448539.pdf
    • http://nemochem.cn/upload/files/dubogo.pdf
    • http://kunmobile.vn/files/uploaded/20210919/file/namipadavusirakedu.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613797e7adf4b---misupezali.pdf
    • http://www.jasolasia.com/image/upload/File/gujokaloxobor.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/pavuje.pdf
    • http://nadiadsa.org/userfiles/file/8234920781.pdf
    • http://egyptlance.com/userfiles/file/sivubaludug.pdf
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/begazofololunox.pdf
    • http://bige.vn/uploads/userfiles/file/70723751521.pdf
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/vuvaretorula.pdf
    • https://aquafilling.com/userfiles/file/44980411070.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_off0000d68e.bin
9a1a8f44ec654368fe2ee76c868880754b7fb1107c979a5395d93fbe737b3b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 10608 bytes
font_01_sfnt_off0000eea3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16792 bytes
font_02_sfnt_off000106b5.bin
8c8abdf3b65263e6bb52fc691d12c16b870880d83a7ee7eeb2f6b7e9abaee943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 18812 bytes

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