Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b833817f1378232…

MALICIOUS

PDF

143.9 KB Created: 2021-07-04 23:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f95fa310b05cbaa2921cd21a317952b SHA-1: 078eaffd7c6f097a9b3651dea8736de93dfec40b SHA-256: 9b833817f137823213cfd74266eed06bbe95835b1da75aa0d82dee887169e1f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vinadesigndanang.vn/uploads/image/files/89897843460.pdf In PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/nusitifojiwe.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a30eabe52d2---72644208574.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8f3884a4---talisopomaxawemonigagorud.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac2d93f69---geniwejaxaf.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f893fd079cc12ec0924a5fa45aab7aee/zamajuxikozunuri.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1bbb40bfa---finup.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/41c231f29b3e222db4f17d27baa6abfd/19779784541.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa59bd5213c---82139001716.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/88136725887.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/rojoburiwirafenur.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tk8gh4m6rad2i3tvtekgmpp57s/doxikosarovanidipumubulov.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ccebb2d806e3bfcde81c5534396a0625/kojaf.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/abc4db641ca92c00a5d1eb922e2a3708/debozetemosofogutogum.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a230350da0---7399873929.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/3e3aqonm2241gl268jumn3d942/nekeboropimoxobijogar.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/lupovofuvagovujatil.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36615ed40---madunelalebojawavanuzem.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/77941681374.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa758c7944---75494910419.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b5aefaf0---68501755895.pdfIn PDF document text
    • http://www.dafnimimarlik.com/ckfinder/userfiles/files/75136289874.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/m63jkcgfs7r7sk3l7slirr76m7/54843719661.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb49a02aabd---80378314554.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/puxuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hansa+meaning+in+englishPDF 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_off0001ca47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA47 22724 bytes
SHA-256: d7f89d5bd969cea543a878951126fd62d2f24ca4999ca8aa7c1577752fafec85
font_01_sfnt_off000201cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000219e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x219E3 10228 bytes
SHA-256: 2bb90f1f9fe240e5e5413f12e435a69d30cb474bdb749318dc63f908f8bc5708

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