Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ccd12025f8ad92…

MALICIOUS

PDF

128.7 KB Created: 2021-09-08 10:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c55d6c920b8b22147314d3e3cea9d2c SHA-1: 553109be978592eb88893e7340d8dafdb4e648da SHA-256: 18ccd12025f8ad926ac65d65619a7a22b03505e2debab1103535eb2edd19738e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware distribution sites. The file's structure and link farm nature suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0fb2bf6f705bb30a3195439666c6bf82/66818045022.pdf In PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cejvhocukp4b5p9ktae3fens0s/vasaniduwem.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ce3cd3671---keserobivera.pdfIn PDF document text
    • http://markone-tools.com/upload/files/88993868181.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161049e711b460---58985695202.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/6632644999.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/vonewexuzo.pdfIn PDF document text
    • https://medius.sk/userfiles/file/18535572825.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/nujazexivupev.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/27484086444.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8afbdccebfdaf8bcd6edd7363461bf67/43592061753.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/octg5btt1bh7c0qb21rfvt96g0/75780715954.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/84629822690.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/sowejarebagup.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/232871529.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/serijebuwuloparokojaz.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/98710182275.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/feliwabewu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea0eadf65---vulojodazojuvukexa.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/50115162340.pdfIn PDF document text
    • http://kd-council.com/upfile/files/69048975049.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/54914323659.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/40429448519.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160796b2153cbb---rogivurabitubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=insel+mainau+karte+pdfPDF 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_off00018b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A35C 22812 bytes
SHA-256: d664409e890b4ea3fb79c39cf71fe28f351c6213f021134b9d9a6cb636e3d8ac
font_02_sfnt_off0001dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC84 10680 bytes
SHA-256: 2db0fc35c348c18843716a1db0635cec5a8d5ecd8523240022745cc2f517e9d8

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