Malicious PDF — malware analysis report

Static analysis result for SHA-256 0875faba0965b2c4…

MALICIOUS

PDF

115.3 KB Created: 2021-06-29 07:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 568a310a3edfddd5454e377d24fbe0c9 SHA-1: e65b24b47730a41b9860d93cf0626349ad5248f2 SHA-256: 0875faba0965b2c4f3191259524a68bd6e4c57ff66ea8cbb563f073195384b6c
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd453ed86---fadoxisozeku.pdf
    • http://tehnicgaz.eu/files/file/kilazilokin.pdf
    • http://caryhigh1987.com/clients/41333/File/puziwixeluzilado.pdf
    • https://thepainter.asia/upload/files/givepekagavuzafenanuw.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d330a0fbc4---23909248419.pdf
    • https://isleo.com/i_photos/file/64884923399.pdf
    • http://softtox.com/new/userfiles/file/17903983521.pdf
    • https://tipresentoio.it/images/file/lomawewufajulonegomijufi.pdf
    • http://agataklimowska.pl/userfiles/file/36891671943.pdf
    • https://bakotech.at/uploads/ckeditor/files/66228937651.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b10c8961543---putizuzigifunefej.pdf
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/refuvolefonepodegir.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93eda8715---1735795866.pdf
    • http://didocrosby.com/imagenes/file/56379324204.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cc7d7a5e5c02f95ab521cc4aa2c1f6ef/kopabopusuvirujem.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/80040c455d2ed9a7c107d80764acc8e3/11357341352.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fu947vitqeittjjbjpaqefkls5/jofojogasovavowogaj.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/afd57d6d01fda069368c0d8142df9475/21134259276.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072132b3e1fb---nixibinazitakigupadalip.pdf
    • http://massvt.sk/editor_uploads/system/files/bezukuwasi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/db25323e00602ccb56359021c84c9b22/povalarelexanekuvipinimin.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16092362f52287---60435701693.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077799ec4904---94250218995.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7a3bd476e---97027139598.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=adele+you+could+have+had+it+all
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016459.bin
b8ba8b5d6ce00534d2f7d1fdbdb005dd47fd5fb720bf844638a909d92142c4dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x16459 16816 bytes
font_01_sfnt_off00019052.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19052 16792 bytes
font_02_sfnt_off0001a869.bin
564eb3013e6c5e132fea676f3347b104f97641d41c69552346213bfa66ec40c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A869 10356 bytes