Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b7f6a7bf1c5511…

MALICIOUS

PDF

95.0 KB Created: 2021-07-24 20:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b4a57e0e0faa1728015c98ec40d47a98 SHA-1: 4932aa639829f2ae2be8bf475cf30ae7c65c18d7 SHA-256: 66b7f6a7bf1c5511d9f28f79fc40af0559fae27c54b2796af66c3aaa1a87f5f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://lutechmed.com/Images_upload/files/nipuparukux.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083df06769ae---kedukujewuboxefovev.pdfIn PDF document text
    • https://ivaco.it/file/13673945884.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/tepoxabepuvefiz.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/54806002344.pdfIn PDF document text
    • http://hkacca.com/userfiles/nidufelonasukewimubo.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/lirofem.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/watorimo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/7268652278.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/sutemaworanowigutebedog.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391ff1bc74---1820915370.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/sipujomagijevipugi.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/nisemoxidapegozewevutewi.pdfIn PDF document text
    • https://fishboat.hr/files/48464855386.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210616_850086A2B13F1325.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/xowefolesimapigoxipisikab.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a10636c2c---pizugimun.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089381c40c49---bexaposatibib.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/sexibogixudivukofopa.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/kabomilelofivuzazezepe.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/94625e565329f80103aba715c4ce3368/93186374669.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caba3b040b1---mobusivewuzapuro.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/segorunelodope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+great+gatsby+valley+of+ashes+quotesPDF 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_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 10828 bytes
SHA-256: 6d3125bd8569669164f11c830fc4973b5ff448e935c74df466149e3de97c4678
font_01_sfnt_off000127d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 17444 bytes
SHA-256: db30bba2d7ca23e93616376ac996da09ddfe00618ed950c3e9978f05e67e33ee
font_02_sfnt_off00015561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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