Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb1e3430cf0b1ae…

MALICIOUS

PDF

83.7 KB Created: 2021-06-29 18:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bdb7e5246fc00ddcee84cff9159137c1 SHA-1: 48b44d415236078c9af990fb17bbb3caee03e12b SHA-256: ffb1e3430cf0b1aecb0f27d5b1da87cedf00c5e03505219cb4d71edb5ad89fa3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the nature of the links. The primary purpose appears to be directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/98d9c81787f43507c48ce2ce560c08ce/54463195604.pdf In PDF document text
    • http://www.moyekolodin.com/files/pededebiwapovapizidenagef.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/uavcch1jri05743vs3776gdu8t/81286069046.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1b848d4c1b192b174b2b70691d9324b7/zixopabovuwox.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/nagupoxobilutowo.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/posadirezobejefetutomibo.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61af28c18b---63956426057.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/64201007808.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b74de92464a---polulebisevowewu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbf78aebc---48491082581.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/253c440228e6643ae88bb849c9094032/dolelenexot.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607b845c7fa79---59748071819.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83548f481---79148104222.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/79115129710.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/85597021100.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/64oe457b6cp3e0u219e2gl5ob3/61723781358.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a16788739ae---51404696254.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/fofitimoladisuritep.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/rmjhgp3begpnjjj6fesljd07f7/nogep.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/bilemekowagasegifelobiv.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ae92a881a33b0a6ccdf833b5f6930461/9372267758.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607908bf9759f---62473197272.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/35202a41a6133e795a5097d332866733/nidolepesuwakigewola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=low+white+blood+cell+count+medical+termPDF 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_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 15992 bytes
SHA-256: 036281032e9648b01d63bac5e8bc3ceff905a034465145494d232420016111eb
font_01_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 10752 bytes
SHA-256: 0f9a30897e57900f07e5f1249d6230b0d61f6dce11fd043ee213d4841c2d4f10

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