Malicious PDF — malware analysis report

Static analysis result for SHA-256 418bbc7a0c1395aa…

MALICIOUS

PDF

70.8 KB Created: 2021-09-05 08:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78a9e4548e64b7b962bb81b655cf37ae SHA-1: f9d1632f628e1c0942a2070b575e89e1da69ae28 SHA-256: 418bbc7a0c1395aa2373e4b6cca36b935f642f01a8e4f40f27ac00bc390c41e4
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms on disposable hosting and compromised sites suggests an attempt to obscure the true destination and leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/23705c2168fb7debf8a94aa9b3c0151a/6213545658.pdf In PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16095477327ac3---29253992666.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/fovopuluzodebib.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/kisaxiw.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/tolapuzexugaz.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/ropagotavubenafurebali.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/xowezedebexubekogimozore.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/48195189841.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfc491dd36---27118671250.pdfIn PDF document text
    • https://kildevangen.dk/files/dafelizesoguzojolelisuw.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/50518472848.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/74382955668.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7d529471e9a79f918874e903fa3dc4fd/tivesebelomuwiripuwot.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/k2nj9g2cd41i27rg4asloq8643/gadolafuwelu.pdfIn PDF document text
    • http://standardamulet.com/files/files/13976507020.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/gakurezugugatulavogimekox.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/45292711657.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B5926DCCD62.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/39424932348.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/rimixibeselugofer.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/bojumewo.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/976e6e658772c48af53db24354959fda/papokutezilamiwasupax.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5a2579cc6a55377c8bc5e7b8eff9bc81/69151815793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=himnario+adventista+pdf+letraPDF 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_off0000b326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB326 16820 bytes
SHA-256: 86fbe04f7644900647e54a854fa974a38611d4efc91ba27f639751c1287c16ee
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 10716 bytes
SHA-256: e172103e03145dba11d3d39ecbbcfdfe6f70690bb0eb8bbd67a6fe2275d22420

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