Malicious PDF — malware analysis report

Static analysis result for SHA-256 4478b647f04b8017…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 04:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f80204958736e4544b5d1c5ad692da22 SHA-1: 8362bbd4a4733fbb58feefd28da9ca5088d5986a SHA-256: 4478b647f04b80177f6490f7e3f92767c95320eb7b389b06e2673698db6a26db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://underworldgear.com/upload/users/files/81501154525.pdf In PDF document text
    • http://absolutelyneon.com/userfiles/file/84843717617.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/muromuxadogexato.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/42280068826.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161385bdc85e1d---sajunajumipezamozewu.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26861476465.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/12640737887.pdfIn PDF document text
    • http://laserinnsbruck.com/static/xopamenobututebukize.pdfIn PDF document text
    • http://kisito.com/userfiles/file/natosenanokubej.pdfIn PDF document text
    • http://ihdbd.org/upload/files/tubokekuxeka.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/20605370018.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f12ca3c6---ribilajavuzagupebagi.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/goloziwozewilugikawo.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/bojelapipabugisetavagofol.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/58939572118.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/zilivexudi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a9fcd67d---zepozanajuj.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/11488842982.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/9582829512.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/41498866067.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea4c301ed6.pdfIn PDF document text
    • https://cartolmania.it/file/zazulapigimawamidizavived.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/zujun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+cast+to+a+tv+from+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_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 17800 bytes
SHA-256: 75f09d693103b7e27c3f027a5c035f1761a807289e2e939ed17bef85db032ed4
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 10748 bytes
SHA-256: 76692fa238fd2dd6c810debec7660a91be41af70f068548eb27538e709ce8578
font_02_sfnt_off00011dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1