Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8ab8c7e7a58d5a…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 08:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3f3392c8f4a46a1e40c9de1c32aea27a SHA-1: 21f1c5a569abd345220378f4fb032aa3bfb667f2 SHA-256: df8ab8c7e7a58d5a83b132e9a59e853d9f9a7db2f6cfdffa712b299944f57446
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to these malicious documents, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://1877painters.com/FCKeditor/file/sipipepa.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m7dumoqq58s35rpn0tulr23ih6/sipatorofusebigig.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/23198412926.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/83b92f9c76704ecb4627771260594b24/92166369051.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd18f9d2d0f---xozefuwupefupaw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ba217ce19b1---53342351698.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/77490786178.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bld6f1c52ug84017ur3e9a28dh/gitawozesavopunepix.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1cb495f6ad02e5bcafda70b846599af6/dumupufol.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/rsjllpqr07eui5t8pvdjb0pmdi/81671285326.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98c97cc63---ziletusakukapa.pdfIn PDF document text
    • http://mamam.by/upload/File/file/47895393483.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1ee12bffe---67659678401.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/62762819870.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095137d1a369---10679547911.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tasurilatuginoluzokojime.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210621131645_1755170573.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/divk9dbh4kq518uk2ca3odhh50/ninevimepi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oerdbkl1fkaabbp0mcir3jr6h6/69026881743.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad496c104---48312111527.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/pomurakeketokixotoxo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/29750804108.pdfIn PDF document text
    • https://aashianarealty.com/file/mukonutabivi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7fe2ac8e5b10c710dcf8161b34a1feb3/maraxopuxopetakivibaviwef.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/25308918180.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d09e8519d10730d2ae2cb645fd6b7dd7/sivozumoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=drake+and+meek+millPDF 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_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 17640 bytes
SHA-256: 626bf76cee6e88ce1e829ba2a0fcadbeb15110df4ce5dc1293db3272f1944f3b
font_01_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001378f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378F 10116 bytes
SHA-256: 5f76ecaf131a96215d3651619427530a0e7949af5464f93024d1b103c88ceae8

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