Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b839a1b12b2757e…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 01:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a656bfd0e14eb2c19d2182219887b8a SHA-1: 2444ab6de8a91dc9f9b5dd7ddd91d4ac24643b3a SHA-256: 4b839a1b12b2757e6b6586f8910db4b40d8b6031060556161d4525b1e31494e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, which serve as a link farm to redirect users to other malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ggp7bgicbclepsr4p7fm9rtanq/wububebenamatulipixojut.pdf In PDF document text
    • https://knurussian.kr/DATA/upload/files/202107260846358860.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/fexoseduma.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608081e0cd403---79791147526.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/egf1maf0m0urm0f6hdb0np57nc/29251561959.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/kabujuredinufak.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jcual05k5h6ik4dj2qmk8qrj41/80145789525.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/zojepegifaw.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210629_35047E363E2A0364.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160963c67dbd37---95703335104.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lubigitaw.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jdo3i76k6oanb99lhs9s1l6l81/5616440335.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/935f81efe3de32bb4f4af725f266f3eb/58777815972.pdfIn PDF document text
    • http://suaups.net/userfiles/file/bunanenuketipolo.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/53632410768.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/789f939cd5007711915cf3b78ea6be28/lafovesiwap.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//mojidif.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a559e71d7---73644735565.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160de865495598---7704224159.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/57939978234.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/50496326120.pdfIn PDF document text
    • http://espwireless.net/uploads/file/46427950835.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/566509b9edff6484ffea57827fc82081/89101986017.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/rujivudox.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/46664173696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vowels+and+consonants+ladefoged+pdfPDF 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_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 17484 bytes
SHA-256: 2d3ef294263fd7fed0014f30394c708d63dcb199543330c15263d1e10000b11c
font_01_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10660 bytes
SHA-256: c4aa3efe7c8955bd8e9a5054aca1011a667b9e1882b893f57b2a92277c794502
font_02_sfnt_off000113ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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