Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ec168788b30d86…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 23:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f8b0789171cae1cc885790bc3d03a7cb SHA-1: 9a722a6a47c07aa2bfddec0948e174a626e509f3 SHA-256: e1ec168788b30d8689d405e91e99da1e742649c39c774cdf4c1f3201f75eb753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The presence of embedded URLs and the nature of the link farm heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://gospel-pour-100-voix.com/fichiers/newsletter/file/32402319049.pdf In PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/getujiv.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/41886326542.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/wirivaferavo.pdfIn PDF document text
    • https://oz.korytnica.eu/data/files/tarijaforepof.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/bibaminixuj.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161327871576a8---gabevasomug.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161385e8e316e8---42846824140.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/23996296525.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/nuwapadisoxobiketikubi.pdfIn PDF document text
    • http://azizolace.cz/images/file/31028539566.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210915163353.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615066d08361a---fisaligijumipemuj.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/delef.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/gejexekozuvemef.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/senumopud.pdfIn PDF document text
    • http://novichiha.ru/pic/file/47294661886.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/zepazagufos.pdfIn PDF document text
    • http://ministerium.pt/files/tupumibabekero.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/65926586894.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/42912039072.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/leduputidubovale.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/93652594027.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-26/20210926035113785264.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/ketededokazirenemeg.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161314a77e1fe5---gejepagij.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/poriwevoxemogis.pdfIn PDF document text
    • http://jadeite.ru/images/file/nenofotudoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+can+i+recover+pictures+deleted+from+my+phonePDF 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_off0000b6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C5 11244 bytes
SHA-256: a36a44aad012d39a457170d6d76f693348a3a809374ffd5651d8dc86d68355bc
font_01_sfnt_off0000d0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F5 16532 bytes
SHA-256: 6960d31943964f66ad3d653a1d0eb2dc58503d900c95039b9a7e0a798c00f55c
font_02_sfnt_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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