Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb8e376b8dd1999…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 02:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69599aa049b1bcf54566fe1e14bb4aeb SHA-1: 5e6e1f7b90afb31b83c28ca6030f205022dfee7c SHA-256: 4eb8e376b8dd1999b29a15a33f7a00e45cc8b1ff117fb7beb860790af5b5ba81
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The file functions as a link farm, containing numerous URLs that point to compromised websites, likely to lure users into downloading further malware or submitting sensitive information. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=bengali+grammar+book+for+class+8+pdf PDF link annotation
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607974f942aad---rilizijofopopupamivup.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfe8034656---nonokijovupexipu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6657514489---25694115945.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/lujakaloxegusujozizalepo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69d03aac9---50164792968.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e02aca242---44690804326.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/76774725884.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/91466630270.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/64884525441.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/tukaxolavelepijutidorarer.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/93747114595.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c219f53b70b---toxamobanoti.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2c6dec5d8230bbfd37822001572e5ad2/pudofafumubusajaz.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/57669605544.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/tuzab.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/didedawuvorog.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/80703700008.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/cdeecb17b032dfbe3ce9015abf699b18/81233423245.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/murogafaxunadotosizev.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/watikiwusufi.pdfIn PDF document text
    • 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_off0000b338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB338 11360 bytes
SHA-256: 039f7870187a7afc4330ac77122c21eee42fd2eded191bddf2b185057376dea3
font_01_sfnt_off0000cd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 17824 bytes
SHA-256: a257791e9e48188073f3ae611cd5a173f8d9a9a80a5a74db06f992e8ec29a918

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