Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b97d2317397724…

MALICIOUS

PDF

78.1 KB Created: 2021-08-07 17:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 96e32bb73ba476fa7b7fbf58070b9ab6 SHA-1: ac11356d4ec3afd5a9ea71cf8d0db6131cb534bf SHA-256: f5b97d23173977243ed925c04f8133e8c3dcc4f45afa4f72b9fb881fef1cfcae
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content hosted on these sites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/672089c644ef068ba3b882616ca4489e/penufe.pdf In PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/jowabetigojixareru.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/04khl3j080c4k27vg94jif5upi/pakimedilozunisizipiwe.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/telajigovapawufe.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/75060287720.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/710e9441a088187015c5eee1c1f0bb4b/tusawixopuk.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/fb4ad9a700270194bad5eabd82aece8c/84152761629.pdfIn PDF document text
    • https://akvaguru.hu/user/file/mojezedilidepa.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160823015075e0---dusojazuwedetuju.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/n1q1jp5041t439v0u5krmguak1/62303532502.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907cb6704e4---60955765636.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608364af996bd---verowevokixowekarejo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60205050df---bexurukij.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/7108422416.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922027a6c37---pukuf.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/78524460995.pdfIn PDF document text
    • https://yellowstonewildlife.com/natokamagedesilurizo.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090581e85331---gobuxekif.pdfIn PDF document text
    • https://sharenkon.com/files/pamafaloleliletaded.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/51ecf71478c7273a244cbcd15457f09c/61549997539.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/jujenimuwepisefudek.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160797a0ca8849---naxamovedipurijiwisafeni.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/tisajomugeradozaduzi.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/tesanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=biology+mitosis+quiz+answersPDF 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_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 16692 bytes
SHA-256: 9c94872639e033b8e2448979ef0473a0435cd8b4588aa502c63f34f055ef1637
font_01_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 11008 bytes
SHA-256: 84e595d92a55efdf6e2d46ed99c0d0c6dc21933865088ab0af1007de4aca8614
font_02_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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