Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78ad9b9617dc188…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 20:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a2bb1e6aac53658ca830f81fd759216 SHA-1: 6078b46d3eff03598b9b570e60d28a8e6078e065 SHA-256: d78ad9b9617dc18817f47f3779441ca1b393e05917f5b1f84e1591f45960db21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure that attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbbc85e2c4---65954929599.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8a9efb78---35930625903.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/4596154338.pdfIn PDF document text
    • http://soles2walk.cz/data/file/nakokob.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/zamemefinerifozirufezopof.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/wabibowofelojezu.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/kaxivawodeda.pdfIn PDF document text
    • https://actor-conseil.com/files/file/44620539349.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/woxubatiw.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/96262377471.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/nufogaresonovapaletisojim.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/mowamudesatixatenutoxukoj.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ced68e9dd---74758589817.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1310639757a5eabba2419915728b204b/14018009479.pdfIn PDF document text
    • https://ekransamara.ru/files/79211499088.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8bb50ce4---21588031461.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zopoliweralukuvipazepidef.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/furonekigorego.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaddad11d1d---92702785160.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/fepujonulodewezuv.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/846d6881b2139be8a395481b390f190a/sesufenelavuvuv.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/42c18f0d700d56c3ef445ad75e7c6d3d/vasabonok.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/11479623736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=convert+from+pdf+to+word+ocrPDF 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_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 10496 bytes
SHA-256: cc311ba8274896b3f2f721782e53ab6217c3669816bf9f4d22781b7096f2c68d
font_01_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 17852 bytes
SHA-256: 07e30150b9cf467cd3d770589b0796d67eafb5efe521f31383e823346f1aa61b
font_02_sfnt_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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