Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33e15d5184e595f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-07 07:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fe71730a9d128b18c14f1a399fbfd11 SHA-1: 5f33b82941adac24231ca13e06374f4e84c93245 SHA-256: d33e15d5184e595fc1c3eae8fbc68010d95fcfd71471e2f49df309c1667bd558
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress upload directories. This pattern suggests an attempt to lure users to malicious sites for phishing or to download further malware.

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://namratalakhotia.com/userfiles/files/49088915547.pdf In PDF document text
    • http://omonetach.pl/foto/ilustracje/file/27557733170.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81780363660.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fecb6b3048---60919693129.pdfIn PDF document text
    • http://wami.cc/data/files/zabetisawupivetuxu.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/95780648031.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609173558c2b5---lenudakaxego.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d8b14fcbf8b6411bb2f215c9cf94292f/zelinak.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/xutulezoruguga.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/kobazafomuvugonir.pdfIn PDF document text
    • https://dm288.com/slicice/file/nudujadipexenitom.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/46858293971.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/u4da9i1n2jr2g7cphjp9bmqt25/23128715824.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8b8b4745a9aa4caf84bdeba497997436/kasekujakurupem.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/lomilot.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/66184057338.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7097efc3301bada13ad4b0a39ad9571e/86365255727.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/rufiresijox.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/nekogapimafopobugekave.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/mojenojujikojupikunu.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/68368743555.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/45906580071.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/vaxidutupupetakajivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sustainable+agriculture+articles+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_off0000b9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 10992 bytes
SHA-256: 8f18c872b2c83079f02646687c0b450bf3bb75196e73965a93b943b79076ccd3
font_01_sfnt_off0000d325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD325 16480 bytes
SHA-256: 38dc594e4cc9a47679ce00afbd74b9228719391d178af8f98ea38dba77a4deea
font_02_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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