Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8eeb3d0d85cd7ab…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 00:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3bd2caf5be360381243473c9e853eab6 SHA-1: 22f4be22adba34caad91c78d688f8fb0cc07d6bc SHA-256: c8eeb3d0d85cd7ab20ccf3e1da22b78afed38d30d7ebc1d8a8f263b77804a427
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://cructi.ru/uplcv?utm_term=main+idea+topic+sentence+and+supporting+details+worksheets PDF link annotation
    • http://lakesideterracecondo.com/clients/41361/File/bavevaxofinamowibexiga.pdfIn PDF document text
    • https://www.gcnaura.in/images/uploads/files/fumejogotaguxozu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zazujotaxosinakugekulatun.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747f65d18fc---bibevupulamok.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/kefobisoj.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b313e48f467---fevilimeseworek.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/kopidoxuduri.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9e63dc113---91967766216.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8611aec760---33006000607.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610abdee9f1ce---26409470180.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/84503429332.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/71703662847.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed57f04f1---bizesusudebefuj.pdfIn PDF document text
    • http://zenithmetals.com/files/10935902576.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/kafugexuxejemom.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d21eb8ad3c8---75048268484.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160786a39ace36---nipirozijotixof.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16091eac5ec671---nelaxaxelen.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/11159218175.pdfIn PDF document text
    • http://krzeptowski.pl/file/25410831848.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/digetemazetolelapisezojo.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_off0000c1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 16720 bytes
SHA-256: 081b2ce373f31a2cd2b43dc4688399b948a4b54a28abd1e219123a319adc4a00
font_02_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 11064 bytes
SHA-256: 9b56e8d6189bcd7eda48ef0f39d35a26d09a9cd6384f7471471ca2afc5b25507

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