Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1ac00ec913bc4d…

MALICIOUS

PDF

117.6 KB Created: 2021-06-27 22:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 92449a3e61e3cc00cff4fba11e09db6d SHA-1: 65dfca4a05f2824659ed3afb0dc40238523f4f7e SHA-256: 9f1ac00ec913bc4d88d28dd7156240492a7b07879aee25e2176777c28b1b3aee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for executing downloaded payloads. The document also hosts numerous links to potentially compromised WordPress sites, suggesting it may be part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://senseoftourism.dk/userfiles/file/18400276090.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/il0339vgorhqlosnqaoc5aas93/tuwobivubawuxename.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76c547dad0---zametakebodositipolunew.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/sobunisesusejenowuriwo.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f2321cfc---kukarureki.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/xenapos.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8fef8a726cf5cd2fe6c0494567d84c37/72867917278.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gag0ukc8qn545vog0k0de8s7vc/4071217174.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a9209698908674ea81be3ed2cab30a4c/63911526782.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef5b0b6c1---5632091718.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f571ab9dbe---wovalazasugemera.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5ea605097---bifatebawapel.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/3d3dde0537c49036c3ee591309a01ade/rifoliteperele.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/10267103350.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/451baafe6e0dfc73a0dd8f1089dcdc1a/78838465466.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/verepupolalefulaxosopifel.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2cc8499a2---banubokajazejosorapigevog.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//27394686670.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabac61559---fonip.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5f551597---nitejivutabevuzuxasu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a33961ebfb7---59559483035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=about+gram+positive+bacteriaPDF 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_off000165fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FC 10852 bytes
SHA-256: 8e0c80d04aca1cf160c91cf172c2ce62ae5c50228d9f3551e118fd458a945771
font_01_sfnt_off00017efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EFC 19372 bytes
SHA-256: 145fcedba76cb48a403f45f8750215f461e92705bad594161305d61b23ecf779
font_02_sfnt_off0001b133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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