Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bec81cdbf95cf1…

MALICIOUS

PDF

88.8 KB Created: 2021-07-22 05:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 700b3b61e09136bb6aa944bd388dc045 SHA-1: 88e11f58084f94380e6ef1f128d21296740310e0 SHA-256: 18bec81cdbf95cf1db99e30b1ca8646c7212494ee3d52f06cd26615ec225b1c2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of numerous external links strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/39112ec1834d05057966bd0a3b4c00c2/mumukosezev.pdf In PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d628376511---betapewuwegedemade.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/konifuvapupiv.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/68036916223.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02f334ef2---tixemepus.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/34731429851.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/190be4b280ede31632e88498a2b95f82/doguperepasenemalag.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dmrkmgq4m2qbaoohkriillbee0/bejonok.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c79517c60bc7761fe37f5a5a4c522991/mogojuvegojiwe.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0c2e50f49---4778371281.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856145e70a6---61084167663.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/42739885349.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d662297418---pigedipere.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/59838154590.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/c0vu3vtvd33a70ath2esh616h8/ferine.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/xorud.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/07c6b709487d0ca71197489e450f89c9/67904530400.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/gukuvilokukuputifi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971289b1f88---wafurekubusika.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/44324894288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=step+brothers+full+moviePDF 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_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 17656 bytes
SHA-256: 313ab5b13f661df0556c59f2be4948f0d0e46387513d631694350f16c2513cc5
font_01_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 10736 bytes
SHA-256: 48e90a1e0ae28565fba8ead6fbd2d92cce90d18b0fc9fdbb6d295e4a6bc1876f
font_02_sfnt_off00013b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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