Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64ae0c85c8bd5a0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 03:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0c9262d138ba22683ae647afd3a868f SHA-1: 8d67bb4a0e9a0bfb10cc815cbe584bf835efa4ea SHA-256: a64ae0c85c8bd5a0ddcdd57ada3ded2151afd963a09d7de188d1ac804e4d767c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure strongly suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=legend+of+monster+pokemon+game PDF link annotation
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161402030eff05---tukumi.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/96462511872.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613664891b77f---77359120126.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cfa2bf36---20570338633.pdfIn PDF document text
    • http://ge-mak.com/files/nirumejeninasurosos.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/menupivubufemavosuforeru.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613062b02a26f---47218364791.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/24477499371.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091911253973499.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/13312534439.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/kuwewoj.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3455b1e9---kotafiga.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/nifalitedeboraxajisoti.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/aaee1cba5a65dd610886f8cd213880b9/jolalo.pdfIn PDF document text
    • https://akvaguru.hu/user/file/98393563720.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/17801977853.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/46420266840.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/lezuxujagofaranadatodi.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/23636812384.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161334c2a891f1---bivopidomixegenavelu.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/zodalefaneroxowipuxabe.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/xuxaresepakate.pdfIn PDF document text
    • 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_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 10752 bytes
SHA-256: 0c764d01cf00bd2a06f34609fb2373626ef9a35e614b8a7ff9f1e45c70cdeeda
font_01_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 18456 bytes
SHA-256: 4d6e3f112dd774320f3dcf5134ca87bb2d93ff5ad1cafadb7d3458a940433300
font_02_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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