Malicious PDF — malware analysis report

Static analysis result for SHA-256 188247a700bd7284…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 06:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d35f34910bdcd9bd98817b42a1a7a92 SHA-1: f25242f082e055def6bd959e186770c1f66891e6 SHA-256: 188247a700bd728471fb394f788a7d845be2a6288b5aaf5519fb31360a220564
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://crewmak.ru/uplcv?utm_term=isyncr+desktop+app PDF link annotation
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e92e50def2---47020017163.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/lepilafimulobuveji.pdfIn PDF document text
    • https://lorus.rs/files/mafufidimu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de683ec72---20573606828.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/75120575135.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/tofexeti.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff13e15e0---5122099157.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3b49c64e86130aa33c0be1ec5d194ef0/30416103832.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/weforupod.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/34963952660.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53f888489---8315844287.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/kenavawazagogasom.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613658a660752---25706340597.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/kizalupowaxasisuxiba.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090523111651.pdfIn PDF document text
    • http://zenithmetals.com/files/39825549537.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/xafus.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/10194826006.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/kaginap.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/66144389110.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/tanadikadud.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/sufoxopuxorud.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/95069110942.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/392698603.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/75750490308.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/14206473566.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_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 10524 bytes
SHA-256: d8304fa84cc22c5a9ecab7beaeae92e4b3f6b1430e92fc7db7233d75543cc57c
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 17956 bytes
SHA-256: a25f5a7890ec2026f9c7c40a6da0d6276cadfd8b49fa3e6c92047860c8f6838b
font_02_sfnt_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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