Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1f15e4bbbcaeaf…

MALICIOUS

PDF

114.5 KB Created: 2021-08-13 00:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7ddf122ff6ea0a9ea3cc7e2b9c2620da SHA-1: 75ac1a0b9203dc207b95be72a02e943f5561afa8 SHA-256: cb1f15e4bbbcaeafc7f1f80339d9b25f2c7fad79bdb973416c39c5181936c099
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082191e0a68d---guwoguluwevosasunexetana.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e71d091606---tewafap.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/perokizamunal.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607644d977c30---lewizizipibuwelazesedos.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0e94f56eea24f7f561070952079e9c5c/lesenuxir.pdfIn PDF document text
    • http://belst.by/upload/file/22233806484.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e4d4cb8b04392bb996f9f795fd1950d1/21671884075.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/sosavepadakexoxefuwofovav.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ll6ht4ut6hsmaa0773mtl9hf23/sixamagipewazoniv.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mcir4fgkpja345f9eam61cu693/66614838797.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/mttdsci76tub9c0stlvnusukcg/38693880297.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160909279e16cb---41174549623.pdfIn PDF document text
    • https://master-service.ro/images/file/5627243988.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160840c83c3c46---46045817127.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/58401050217.pdfIn PDF document text
    • https://susta.vn/userfiles/file/28467068149.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a8019d4450c929241b74bc086609dce9/sufulosunitoxosizamatofuf.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/9b598b2a7939d69761efc84c4b8df58c/16206240355.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/baxofulivo.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/losanu.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/tevedatomu.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/7087311182.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/20105861471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+install+corel+paintshop+pro+2020+ultimatePDF 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_off000159de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DE 17964 bytes
SHA-256: 8279d5e06f38b27575e1ecbbcbf2b98f9de5bb44613a5f2afe5cde5580b99505
font_01_sfnt_off00018956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18956 11060 bytes
SHA-256: 6ec0d7ff02a0566b2177e79005e8e77f4de1583c0a4fc1ff4816804024a88b36
font_02_sfnt_off0001a2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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