Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b20e5ace5514b54…

MALICIOUS

PDF

83.0 KB Created: 2021-07-07 13:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 67c3011229c4e6638beb94c54866b652 SHA-1: d988240b3e5525e2b02f3bbf8e4a5025950fe42a SHA-256: 9b20e5ace5514b546a67fe2fc336c55df474a2b7b2982305c4f053df0ec9aed9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS upload directories. This suggests a phishing or redirection scheme designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a38284cf---3903777083.pdf In PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/ninigajimimolarepu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/frkaba1fettuc52rfb7u7c620c/regigewumizirigemukojibez.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/82299147704.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/37092401586.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/zimegeda.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8fe76ec54e31823c5cfac389f979611a/pebaratulajewololijuviv.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/golagedanowinux.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/97917742942.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a2592d96---mufuxofixedetepesar.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3634eed583---6486473556.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d02862f25dc---paretapufirozadititaziwez.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b403670d9---zibazajameb.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077163911b99---giporewelikotugunixon.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/wenalozazedapi.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/keregixitifubijugo.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/9e2cc330ffacea2b0bf1c992e0bbb496/xutegaxilijedixuxe.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/ratukodevubuvap.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a1ed39fcc1792cc96cc86303a116ac5d/gedidaxop.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/dd518fdc07387a65d86dd16d34c02d51/29187467382.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/49249395846.pdfIn PDF document text
    • http://appvid.eus/userfiles/files/68891181924.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/15659495968.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1d0ab16957909e17d9c0cd77b41b50b9/vuwixobukepibara.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b712301d---bujowuwusovebamejune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=london+broil+cast+iron+skilletPDF 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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 10552 bytes
SHA-256: a780ed7cabc0f04037f2d139e14474c45b5247b76815727ec44e8128645eed3f
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 17072 bytes
SHA-256: bbde515774fc135987e109c33ebde01a039f1e7d30898b4aaa480ba8a23766ba

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