Malicious PDF — malware analysis report

Static analysis result for SHA-256 004bb712e326e395…

MALICIOUS

PDF

81.7 KB Created: 2021-08-14 13:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8ce835889072decaf5001d82ad71f49 SHA-1: efcef68db3bfd9ea546d619f359b2131f6da70b7 SHA-256: 004bb712e326e3957d7ac0aab79cefc35cf00847b68f75216555b77fe6964b7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm pointing to numerous PDFs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and the nature of the linked URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f820047f5a---debegiveduzobari.pdf In PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/sehgr91r2ps27cn628o8jhpk6f/vofipujaza.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/wilapudorozevigikoj.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f3004fc8773e5f3ee6c270580810da8d/xujusazatiwurezexi.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/95a81d3ab7b64ac434b1e5cfae8033be/55122966155.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/79036313369.pdfIn PDF document text
    • http://congluc.com/upload/files/30369715703.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/wosad.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65c03a3a3---zijenavusonufinetud.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/53895700610.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e2b432660---tejofozozaluteket.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3daff122531b612cee6edbf9bce65c77/85184076702.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/7e2a85996770202ba015c49c648965b3/kesiker.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/59ajv3vnp47ob2ile0hp3j5pu5/84455001736.pdfIn PDF document text
    • http://toroisg.com/public/images/files/94477660370.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/lemujolamuxu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3jdi24neb45mhkhgf2n1gjvrv0/21680367635.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9cc5d3ee2f61dd51497692f464ba66a6/35542519413.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/c42hm8ddfhg34so1d6k2r2389g/jodojabitesavexonol.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/gifowamivekuwigire.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/40117141843.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/xajudofog.pdfIn PDF document text
    • https://ibextrail.com/editor-images/jexadelajokoxeb.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b785b8477---13928827877.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/veroxivepadijidimeri.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bc6tgsfn97f4nag81e8dq668so/zofototunuvexuzija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=el+libro+de+los+espiritus+allan+kardec+descargar+gratis+pdfPDF 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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 19036 bytes
SHA-256: c30cf7f41f5c332056ee274e278d032d4f0861a5c401ea8315f3cf8764da45d0
font_01_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 11112 bytes
SHA-256: 4dff6073058bfee3aecd497d12c3fc913b1cd2386823336430b0981d19dc7fc5