Malicious PDF — malware analysis report

Static analysis result for SHA-256 a669ecde8ff7292f…

MALICIOUS

PDF

110.9 KB Created: 2021-09-03 05:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b10be12454fcc40d61edebaa7ffeee6 SHA-1: bcbdb15e9225f864f472b7e89c522d8da9efcce5 SHA-256: a669ecde8ff7292f48b4bcfc45f4729239017cc88686964c66fa617130fefbca
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to potentially compromised CMS upload directories or are hosted on disposable domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure suggests the document's primary purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cl-pub.com/files/files/bukapulofugirasazafiw.pdf
    • http://3xlove.com/uploadfile/file/gadezosu.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c280a9624---xuzudibu.pdf
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/raxolopogisasu.pdf
    • http://sloplast.com/userfiles/files/50104068125.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d70a699b370798650d759d4f19d4427a/6268183769.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/5975603997.pdf
    • https://kermanrooz.com/img/files/40142620778.pdf
    • http://csc010.com/userfiles/file/20210822103439_zydmwg.pdf
    • http://vtaky.sk/media/file/36648620429.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/sazesunevorafaboz.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac59570b1---62147665860.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d801b5ab27e3533306410f985157e107/sotepowogimuluf.pdf
    • http://seanmore.com/userData/board/file/70276039283.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/91588740319.pdf
    • https://premium-house.uz/images/file/gaserufaxevekedumimexixis.pdf
    • http://global-leasing-management.com/uf/file/widenebaximutatisugifif.pdf
    • http://dioceseofniranam.org/userfiles/file/21998209009.pdf
    • http://fizjoactiv.eu/Upload/file/novafoma.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/87g0gtu5uj3ojs2kclmbf9hg0m/tukebigu.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad580e95a---71045788650.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/lef2m0agr830s3oae8g4s2kgnu/buvuzaji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ruskin+fire+damper+catalogue+pdf
    • 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_off000148d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148D4 16792 bytes
font_01_sfnt_off000160eb.bin
e176c081479172dff62ad0ff0c40c644fab2e95834ff861253010500b6976948		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160EB 11200 bytes
font_02_sfnt_off00017aea.bin
54626af0a66d95c7d1b3e45b166cba2d8df1b9d613c4bfbaf74b21af99ccbb35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AEA 19216 bytes

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