Malicious PDF — malware analysis report

Static analysis result for SHA-256 747d733ab47f7ce0…

MALICIOUS

PDF

84.1 KB Created: 2021-08-30 12:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5443beee9bac6733329dcf51aeda6c73 SHA-1: 4cad46856c2b9920a66f85edc7708f528363888e SHA-256: 747d733ab47f7ce0cba9234ac33a1a785370fe9480ab2f621feca24710ee50d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://seeandhearbetter.ie/img/shop//contents/puzisusagajagomuniv.pdf In PDF document text
    • http://carzip.biz/files/uploads/files/3683381360.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h9h5rlpfjvnq4a2ovkdvlp9fvi/6590192962.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/lutesofilavimid.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077aee853c8d---fopesonikesurod.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a613aadae---41421027978.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/wuzomonudoludalom.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1d81d4a08---tebet.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/67114913189.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/wakuraluborozesavowemiriv.pdfIn PDF document text
    • http://bio86.fr/fichiers/99517683927.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/85654070335.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/sisalamudegimef.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/fomegexijawexinanuka.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/22076712424.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/vobawonowegobu.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/70278049556.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/wuzimexigavirezan.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9fc0ba98d---90845026733.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90b2a4f9e---kalujolo.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/55802885809.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/adfbd6b17e3ce05a616141a21a7bbd0f/78856309443.pdfIn PDF document text
    • https://csn-alliance.com/data/files/falukalox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=text+reader+for+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_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 10148 bytes
SHA-256: 4f31cdb875b2a7ff5953279ed52839a2eafaac71369ce9f7217ad31307dd97c6
font_01_sfnt_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 18028 bytes
SHA-256: 20fcccfabf4a15552f5a93555989fac8af16e169f64063838372e267d117d187
font_02_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1