Malicious PDF — malware analysis report

Static analysis result for SHA-256 51809426b27f8993…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 03:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b8e9b900d9b2adb7d750a7a48e04e09 SHA-1: 3749becb57863280949fb48313a63a701f692d56 SHA-256: 51809426b27f8993dd299311ce81bd01fd57ce72c7733c7fdf2ee16a2643d663
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://herium.net/FileData/ckfinder/files/20210703_94F7D233AB1E9322.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/fpu51494g3hpq4de066ka4nqh7/37565839342.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e86cdcbc---77499308566.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7fe610aae---dugisejivamuf.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/rogamaluzofokuloxu.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/65227474029.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6cvok9u8g0gdoocusda9vhcrt5/lerisonuzotuxepizaju.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/wabozukoxosokobokuge.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613008773e20d---23117925273.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/52895381977.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aecf91db9b---bojosemule.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f955c6ce9---78655754619.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/26312828504.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7d79f79156265632c6bef573da0dd5af/jiret.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/6d682f3bfdcb461fcaa75e05536a17da/lepujesa.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210716192341.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee523a080f9---nodudawiloli.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/63438656122.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/verajuvusewofewujuxovem.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/newajaxomajurijaxamo.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/532ee5nkj08kv1i6f5nr3mj2cn/pazit.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/wixinufi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/074902fbecbb827f7e6a134fe2e81811/74322894854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+punctuation+worksheets+7th+gradePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 17164 bytes
SHA-256: da336266ac78f3d04dd52712e6289d2b0df440f1aa5fadd8918223d0fdab46c2
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1A 11052 bytes
SHA-256: 4269c3a3f4ada9af3c4cf899a5102cfdcdc0adae846181c1185e11e5cdc2253b

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