Malicious PDF — malware analysis report

Static analysis result for SHA-256 5faea054fc0ca51e…

MALICIOUS

PDF

91.2 KB Created: 2021-07-19 19:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 4d0cdb4a2d3c2241b3200ee6358c45fa SHA-1: aa036ddecd0c0d694fdd5062d2f50445061ceef5 SHA-256: 5faea054fc0ca51e4d3d4c8279749b6995266d13941a227a0695645bdb4558ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm heuristic, indicating it is designed to direct users to multiple external websites. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous URLs hosted on compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8cc784b6f---72917637105.pdf In PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e17aed7d---wifutib.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/94041940576.pdfIn PDF document text
    • http://princeverma.in/uploads/files/94351416582.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a41c5558---67128550051.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/88874106895.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/vuvegonu.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/jopusodefabuxavupenegigij.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f0dc947db6cb2a08a976242f834fda9a/fudijanix.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/75488916324.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210606235647_c9744k.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71ed4a9af---90988394708.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de70a54f4ad---tokobumel.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3b4764f2d97f2b6de5c242240cb3d077/28085276910.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/55773048629.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7968f4f783---vusexedivenurakuluve.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87d295495---82954528779.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779d137510b---gafefemiwupate.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3bf2b0bd93768115afbfacd9495850f7/gebugegutulunofedajo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e8f071256c294eda870768df3cffcb44/valupugugumudivoziku.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/78283380907.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3fkneilhs18lqmg1qaqn7ih5i7/6545659387.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/52f409492b7542f0dfc295e11b48db19/10952950851.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/1242467920.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd43e13f4---birejibigajib.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ajgcjgb8npgpvgt6gf5pu3k3gl/74312063896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=is+realm+royale+cross+platformPDF 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_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 19988 bytes
SHA-256: 828dce76b75c4e5a610dc86142885371be81d228a531bc736befa957a21f914e
font_01_sfnt_off00012f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F36 10508 bytes
SHA-256: 95e6fbd9968e1deaff39301177da6e5cb33b8aef5e31069bfd5f97862495ccab
font_02_sfnt_off00014744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1