Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4644da983409146…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 04:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ea754c9afabcf70b35380042fb0b478 SHA-1: 30e74d85c0bb2fdcea99928e007a226470dc6421 SHA-256: a4644da983409146e187a0c4397ce85267da3d9c73f0d78aeea19448375d5ae1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sharedsynergy.com/userfiles/file/nidugedelef.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9dvuroeu0438hs9t95vfqr6p97/vugibuzogotosisezivogiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56e210929---subosopojajog.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/jegiwimedefuvibejoremekoz.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/mogaxeli.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/33767981238.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/sexeba.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210913_AA7E4BE27B80749F.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/77468444264.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/ninarufok.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/jovabajedupux.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/rusademavasoxinatapeso.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/mejawat.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/84500728865.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/nijilifupuxilotawef.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/uec0gfa52tfi846iet32481c8a/30835577932.pdfIn PDF document text
    • https://parfumzone.ro/files/file/soxesefuwos.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/14363233770.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/tajejojakowawewezilon.pdfIn PDF document text
    • http://elma1.ru/!upload/files/kegeli.pdfIn PDF document text
    • http://ossokahve.com/upload/file/fowon.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/dobifi.pdfIn PDF document text
    • https://ikima.fr/uploads/file/pifolidedume.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/257471682.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/20104455534.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/gufimafosinasugexewidida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=windows+10+home+single+language+iso+free+downloadPDF 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_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 16624 bytes
SHA-256: 7c077b9c55f46822992bb1bbb70bd520adb008ee76f87d889a28fcd4bba7a5ef
font_02_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 11056 bytes
SHA-256: 662119192d29f6fa53ba88c0ee159f265b3dfe5920734895cf1f38079122a475

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