Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ebc6628cb06697…

MALICIOUS

PDF

77.2 KB Created: 2021-08-28 05:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 203b61c976cb2e9b0d660fec785285eb SHA-1: 390f4af3d8b15faf89157e93c2893e5d72352786 SHA-256: 83ebc6628cb06697675e41ed33530d04ef65d647633feacbaa4554b513702aa8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure itself appears to be a lure, likely intended to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://eastcoastbiker.de/sites/default/files/file/95337061387.pdf In PDF document text
    • http://techcessgroups.com/userfiles/file/88249359804.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/12322880141.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/26442ceaa4922e1285f0c4d540ada7e1/22310161953.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611729fa7ce55---22083643362.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/gofagoditaxogeziw.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210724024509.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/43003601287.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/14934638165.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8b9d5b82---duzos.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a1bdd007e3---doxumujugowoluk.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202108201027277689.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e2a0b5a8c---kidamapuno.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874a87c80d4---42110861993.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3796ee281---61993759159.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/20352724921.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161049f66cba5e---10852474900.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/161030080c6808---wolifalazaxejirem.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/pumowuzakafalik.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/gikagafuves.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2681dde7---76206444470.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4141bd5680c2ec4cf999896509688363/28647092772.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f176fac7---92934992924.pdfIn PDF document text
    • http://apple888.vn/luutru/files/23726758419.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/ragubomebubidikupanik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=strategy+activation+in+strategic+managementPDF 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_off0000cd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 10784 bytes
SHA-256: a850d23ae4be3d4a7886e641c722a711cf0135e8f4e917429ea2bbc3ec8c4cc2
font_02_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 15664 bytes
SHA-256: 4e3b2280d8fbc8884a14bd9c25527c75d592eb1008d50edcf3510d4638d5ad56

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