Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c11694cad4c861…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 09:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41b82432a685cabd3274132e1609f466 SHA-1: e5fb360f7e5ce68674729699afa96321cf95651c SHA-256: 21c11694cad4c8614d37dd9f7ec607ef316dc15e219ee5ab306ccd901d83393e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many hosted on compromised WordPress sites, directing users to potentially malicious PDF files. The 'utm_term' parameter in one URL suggests a lure related to parcel pickup authorization, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b4e9190d---pixapijarajadate.pdf In PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/3bc149a67918c19ae16bf83e513fc68d/rigusaw.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8hgc32va5hfmtpm7c41ab46ggi/ziwusuziw.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1cd3e034d---dosagamam.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/62037478817.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6e227e1ed8dbe5819ac397a48860fc63/96054962904.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a43e7c8bfd---finuxukupunarejodegujo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b4f26c588d3e033fc32cd359fdae40c3/76849310771.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/c5uhqb8f0qknti50jjv6fsgq2o/lomokenelexugolonapab.pdfIn PDF document text
    • http://merwepizza.com/upload/file/rakunexaxibiruzofubixudap.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5b494b13d5319b8e98355ac0750d2a9c/vobonabumum.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210516025644.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/c3998ef2913dd6f512bede23ee5dbf98/19357588392.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/18d34d733e18effd64c92e1abab8a6be/93676667476.pdfIn PDF document text
    • https://hirurgija.me//files/13638947533.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dlijd0c1dnjlgb1vp261fa60e9/jemilifejinanuf.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b601e4514a9---vipatomakulijixalixudikus.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088179ab1b6a---5976287244.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/kujimifuxulafamo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/32886239ae6e2e5e5b059a25472b5f74/gapuke.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/jezenanotitaxixugodeweru.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084626e63580---15979560991.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607316b585b3b---degedasubomatalutad.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/48f24a2f8fe067023a358d99132b253a/sidilarovora.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/95ff95671c0319659c60e45ec8368be6/78739290601.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/59356821840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=authorization+letter+for+parcel+pick+upPDF 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_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 17264 bytes
SHA-256: 57117013666014570a2340628fb73bd908ce750bf7d372c5142a9b6130330d16
font_02_sfnt_off000130a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A6 10644 bytes
SHA-256: d208b36e38ffff3313557169e1a2a4aceac5a10e209623cd4f5e239523228dd2

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