Malicious PDF — malware analysis report

Static analysis result for SHA-256 4765f74667a2f28c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 17:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7400813594c6fe08ccfe43f585fe4019 SHA-1: 533402a5717547cc54e0796be8f892aab3137024 SHA-256: 4765f74667a2f28c48d149e52696980bffc1c8865b455f2e71fada1b67afcd8e
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 pointing to disposable hosting or compromised CMS upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external sites. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://automotiveenergy.cz/userfiles/file/zukaxodapivor.pdf In PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/48941571371.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/17134659129.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ea08f1676a1f5cd264751946522e810c/werogu.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/44900789001.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/puviparodotasekozudujit.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/35995600807.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/15096503632.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a0ef06424847a582797d97824ac39099/27082173330.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/bisafibuwenukarokutepun.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210917115419.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/20457265738.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ede246ca---93642857243.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/vojuko.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/49331687147.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/38424114493.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/88378691259.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/sezubupo.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/dekesofe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3eb42ced5744740f747dfc15dc4a849/lomunow.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/1233931008.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/tizagapinujupitewegeni.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/zopomuwisufelaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+phone+processor+typesPDF 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_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 17880 bytes
SHA-256: 51882842c70550cc83a264775ca4615d558867c9dfbadd4ba86da6d272dad16f
font_01_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 10496 bytes
SHA-256: cac5a9c005ed5578d1efec567dd817b9bcb2b7f0da41a116d8e386509aa86c87
font_02_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1