Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c68beae32c173cb…

MALICIOUS

PDF

81.4 KB Created: 2021-10-17 04:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f9151b2b79cee0bec648bd71730a4305 SHA-1: 1820cdbcdebbfdac4759afcefd8e83a1ffca4523 SHA-256: 0c68beae32c173cbf7a7c57959e8334761296503041999dfd5cc8f1d4f742618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the collection of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16167343ee54e9---59505552467.pdf In PDF document text
    • http://nagymester.com/userfiles/file/nejopifulopumijumunupog.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/tixepujono.pdfIn PDF document text
    • https://steammining.com/userfiles/file/17902457288.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/79285337667.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/45075264824.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614789efb077e---tuxowovivadunifodukafoxow.pdfIn PDF document text
    • http://wjcopy.com/upload/files/1312950744.pdfIn PDF document text
    • http://amdind.com/userfiles/file/zafurewetu.pdfIn PDF document text
    • http://posuni.com/userfiles/file/64115084119.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/22659224804.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/1544201bf9292e7865dae40153e72263/wejikajotazo.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/dewodamepevom.pdfIn PDF document text
    • https://8-hi.dataroom.tw/upload/file/17431196959.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9502db73f---42814220758.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/54446334191.pdfIn PDF document text
    • https://signika.pl/Upload/file/lewibezozokuvula.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/rigemawaziwapumedovuxunid.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/63558259420.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/1794541014.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/lapotonux.pdfIn PDF document text
    • https://birotex.rs/images/files/sipotunub.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=how+to+convert+png+to+pdf+on+ipadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616b5aeb13930---ritujuxijumuk.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/72301540763.pdfIn PDF document text
    • 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_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 10724 bytes
SHA-256: d34dc48f37a5d80241399af4b0cf9b2359e5896843757c8ffcb4d0aa0c6edc02
font_01_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 18208 bytes
SHA-256: c399c8240b9d5ca0e60a0ad68ff0314fe12b220074704e710f6574e481e701f6