Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9edf7e22146605…

MALICIOUS

PDF

98.6 KB Created: 2021-09-18 06:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a7e230815c3e868b0b35d0f53a69dc6 SHA-1: 72e1dae6b26c1857c06c4d40cb4f7980b4252f86 SHA-256: 8c9edf7e221466059b02a4447f7ec0f9fa44d8c76f4b0cc531bea746821c2b76
196 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://parkingparts.com/Upfiles/file/11750317284.pdf In PDF document text
    • http://infosierra.es/images/editor/ronuduvowudun.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/tezeg.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/3823541151.pdfIn PDF document text
    • http://sissonne.hu/editor_up/supokiwud.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/ruloladefi.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/xawafabexutujitem.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/vesesidazigi.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/kukedekiluw.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/dalafojegu.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/3svtfqspbec2bhkq4e18ttcmdo/11213711863.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/tedejugenizisidawap.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/wajolisuvirejomono.pdfIn macro / runtime command snippet
    • http://es-manzokudou.com/yamituki-n/uploads/files/megolujitejevamesusel.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/12439619184.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/devanepeto.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6bd13bb477d40d3310fae4a980a8eaa3/batefigikedudi.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/42956996009.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133788016756---98341414930.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/wasosenabonuwofaribifi.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/zibeliduxawu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/46afabee279f716e6b740ebf7fe54b3c/21697381604.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/tewuwepaniwimujapagaturi.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/dodilexifuli.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/filIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=32+degrees+farenheit+in+celciusPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 10932 bytes
SHA-256: 1accb70bf133af6c14ac58faaf9423d646110eb5440184e628fb47797f1fd6be
font_02_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 17232 bytes
SHA-256: 9d1b56756b1544dc661f571197e484b18d5fd92d4c81527da5d640bce0745dab
font_03_sfnt_off00013d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1E 21212 bytes
SHA-256: 19ce78876ebdc1a2d343ab73d489f6aa70289c11a237cdf7623cb513661d19e2
font_04_sfnt_off00017306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17306 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105

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