Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5084f404dede96…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 05:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fae8d8cb6804a83aec34139a30af3a7 SHA-1: 5c541bb6b17dfa17423a558221f2a36a421d0c0d SHA-256: ad5084f404dede9612c67fd72cc9b5954b2408733c44916a4b159e15d10a2897
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to obscure the ultimate destination and potentially exploit users through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae641b52bf9---52510270556.pdf In PDF document text
    • http://gdgom.com/upload/file/210616155247739479g5kz77vrb10e.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/legitabukabisulukajuzid.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120f509537b6---sesibowutok.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac334e988---danunezojatuz.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3e02d086---94205303618.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/95284951503.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/77253283206.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/55038457721.pdfIn PDF document text
    • https://12shio3.com/contents/files/karelobekewexaburumilifi.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/12340247377.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/vixenaxosaxul.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/refezalasegapo.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/xuxudazelirumuwa.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/24597373261.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/selasibulunupotelenudafo.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/gebel.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45eda988c8---91221602391.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/48984705816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=all+electrical+tools+name+and+image+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_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 17868 bytes
SHA-256: 4c8aafe73758aa5e19e2729516cda4b15d7bda8ed0a090787cd9c636580a136b
font_01_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 10944 bytes
SHA-256: 5d8edfc13f25ce15aa4b98043e79623a935bf4eda8e9101832ba0dcecf6c9150
font_02_sfnt_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1