Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45fe33ae4e03014…

MALICIOUS

PDF

112.6 KB Created: 2021-09-02 21:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd33766a688c6af53e03f7e3e2efa856 SHA-1: b175be43a25c1bb47e3d188293ee26a6f857406f SHA-256: d45fe33ae4e0301469f8c99b0efa3b14f4d20024a73fd6208953a3f4a6a85977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used for SEO manipulation or to distribute malicious content, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic confirms the use of compromised CMS upload storage for hosting these files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://investmentskillsgroup.com/images/userfiles/file/tiwokepuvezarilifimasuxu.pdf In PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/gilezutadepavolidiresesop.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/jkq4onpl8oo700825mhub2oek7/68562605388.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/62806188925.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/8c5347ef4f85d752375e25c36337f849/73309835710.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/9734385188.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103058b33fbc---87518925954.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202108110337419753.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/32250664475.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/resuwoxela.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gmnd454v46g8sgfrpevsmtcdqs/78794043303.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/89015656499.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/6dcb42f60e9e8b1a285bae7e168c0754/66431107545.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad1f7b2925---bapufowegojiped.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792a267a049---kumenumigogituzaxeluguma.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1627097930.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/nexiz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7c1fc915f---28365111406.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbc30a5a11---dofapemilesetevomejov.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/53742536284.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dtv9urt7bbb7ok02en5djqqns3/matufazojes.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/64770558372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=archie+comics+english+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_off00014f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F13 20120 bytes
SHA-256: 7ca49db279f879502fcc448a66d7ef3856aba9b9b274616315fc9ef3854a14f2
font_01_sfnt_off00018430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18430 10788 bytes
SHA-256: 362aff5f533659e5767c3effa3851dccc50da7999b896b8bbe598fc2919ac166
font_02_sfnt_off00019c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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