Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6b5d8f53377ea6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 17:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5902d2834a91c761aab5b8e26b477afb SHA-1: 016513a708fe4c50989fd4443618f76b1b3badb4 SHA-256: 6e6b5d8f53377ea6dd1924a40b72a64b87e2a82c346d29899b3bccdd64c3cb0e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=rv+campgrounds+near+lake+lure+nc PDF link annotation
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/luzanafa.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-22/20210522091536779664.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/xipedexipesu.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/30228064938.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/81336733858.pdfIn PDF document text
    • https://produsedecopii.ro/app/webroot/files/userfiles/files/misagoxasanukojegifip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09972ec719---44538468125.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/43958465139.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021728111458.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/618ae2d1a37a0551a563a3187418f1a9/99012954343.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/pazaparubimumixukasomeze.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff537226ad---83105850461.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6737feb614639afd19c2d66c4d462846/54017145707.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/76812264099.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/dofev.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/jorejuvile.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/006bef3672f4cab53f55e6b9af41aeae/sofomojegikivakopoker.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/tokuribekedanof.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d4b8d44c---41222131439.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/36263819977.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/dixugop.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0967f6a17b---48917802865.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/mufebumovarijuzifa.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_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 16664 bytes
SHA-256: 75c9a1a67eb56545c2aa3c4e1e9df355f84ea3273eb6349710bec21e4ba493bd
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 10972 bytes
SHA-256: 8a3882829dbcf5d4aab1c02b56e72755e165739360000d2d51e8d7bc05c891b9
font_02_sfnt_off00010ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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