Malicious PDF — malware analysis report

Static analysis result for SHA-256 17666b6e760ca11a…

MALICIOUS

PDF

103.1 KB Created: 2021-07-16 08:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef3e237d1e87211a8640b8ecf32cdf9c SHA-1: 656d7570998ade1a65d1dcd8bcb99245fed4f7c0 SHA-256: 17666b6e760ca11adcfcfad615939a0fe9e46df092c5a27e56b6fe93eb397e28
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of multiple links suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2ed0e369f---wisuwikumuluzuwanuzid.pdf In PDF document text
    • http://phrabat.net/UserFiles/File/96980638637.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/52743151436.pdfIn PDF document text
    • http://schokobrunnen.com/idata/wikefive.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/37025798088.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/31965965146.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vsl92bmdlo890o13cg9e44bdi0/32813535636.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/37198439890.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuxubugaluxewiwuk.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/76386035884.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/tebanojezumotakopal.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/7e29c2799a69a393a0123f75475acdbf/lewobotinofalu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf4c048d2---bubobidevejevorajaroxupu.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/50667985792.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/66212729837.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/carbbpt6mm664tp5ebtpo4rnn4/potelobova.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/1341015708.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/63939714681.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6bb389c6---lujapesagifawoxub.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/cd2df53f12bdc310d8cfa95ba2ff4e86/luniwebop.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/20bf8c6c7235bed3277fdc2eae3e57cd/11608178588.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/pn7p25ele9inqkg8ssa1gmjra8/57823521684.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/savabapedifabobepik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=3+stages+of+moral+developmentPDF 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_off00012fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 17776 bytes
SHA-256: a58d0663a72ae4446f9609668c16af52c3bac54c127dacb0ff1ba5d2a156cfeb
font_01_sfnt_off00015e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E58 10888 bytes
SHA-256: 5a6cc2ddb6bf9faf106ad6a8beb2e6826078f43c69bd11affd2d9d6c9c964288
font_02_sfnt_off00017756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.