Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1ee1a5c2559ee8…

MALICIOUS

PDF

97.6 KB Created: 2021-07-26 15:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 436d4f7145fa338b6fab69e89d6c97ee SHA-1: 8a8ff1d6a650152e9452b568ce5eff979c809a16 SHA-256: db1ee1a5c2559ee8c7946470fcc2d576371ea3c010f9798068bbab5b4453a25f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially using embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • 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.
  • 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 https://jbdclothiers.net/emailer/userfiles/file/77111916643.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p6548801qv5g3chvcjdjhtas7v/53223056882.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/29727535106.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/22pe5qm2ktfp9u5ji4g5kul7r1/89223771049.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/sufujanujogofomavanonuna.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b51cbc6ec4e---21431389229.pdfIn PDF document text
    • http://minipit.com/data/files/79188334480.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/murasumuvimarirofalu.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/lowewotaxoxujolidefiwobag.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/razirosumapidamidikuwelob.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5991d7aa4---35238437647.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/41497364271.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/28bcc585e371cddf6229f909c8476373/93546703846.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f43ddaee7---dijexiwigimitoveje.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e6912530---pefagagovosobawekazusir.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160edb50881a2f---benameful.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c2e1da17b1e4b51739520cae4e52abf5/85986706058.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/mnlv2tvcjmmd47pe89oso7abj8/93201187942.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/wijedive.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/81154635146.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/45002000992.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/pujefinomewuxatix.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/45704703143.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/17852202206.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608f425dc1995---81373326225.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/zamurumigikupulopan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=quantum+chemistry+levine+solution+manual+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 21168 bytes
SHA-256: d78c1d9764c4a50a99301bfbfa4badc794b33ae29844279dd004c5b6a2e64eed
font_02_sfnt_off0001512c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512C 2832 bytes
SHA-256: 67fa9d785102b0ee663be9ca80a723452fb5d301630b5b455dbaf8a384e5e091
font_03_sfnt_off00015d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D05 11224 bytes
SHA-256: f39d244d4c3daee7494465723255ef32343640b106d984d1a1440e2a55c95f84