Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70e6b5808f4f654…

MALICIOUS

PDF

79.7 KB Created: 2021-08-18 06:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b22089d4ab4b895d8b77a39759b18c86 SHA-1: d7a92538e2b567c0a8041e78d2e9c5bfed19a27e SHA-256: c70e6b5808f4f6541d8d9a0f0a2d319613f51783c69e13c156eae771884f6c85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, each hosting another PDF. This structure is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609947256aef1---bizolezijoralik.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160efd7aca576a---82864278480.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f8c4c09d1---wojovamoji.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/860eh7fapsq29hr01hpfr5p684/deteriguzokuwe.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tabuwavaf.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1be0a9a5---39712171728.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/sadizi.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/witojegozivapa.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/13c1329bb14c65e9715064585b161136/xixubegebegodej.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/aa053f35db148c52f294ac4d3c7a58cd/11391323297.pdfIn PDF document text
    • https://eklyps.net/images/file/fufevunibanarut.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/lezasejipovosevuxukijoz.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/91061833425.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/suvovowikeweremadav.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161107045719cb---vuwizaxanutojito.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/pejase.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/89412705904.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/kubetaseg.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff08cdce5f---65385682029.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/roluzogibi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf14e6e84f5---wesomurekerutegalogux.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/33e25967d00afdfcb54e948277bf1358/48076841806.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/3943919750.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/jutinobevuginakanodala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=onion+and+cheek+cell+lab+report+conclusionPDF 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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 10968 bytes
SHA-256: eec5db713c3a347a5edc341472f7dbfaf1bae1d578d56d1e611ff0e5768a33e4
font_02_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 16812 bytes
SHA-256: e2375bfbd57ccfdd29a8fc70fe53934d0ed6dae59cc69ae0f072fd76ecb210af