Malicious PDF — malware analysis report

Static analysis result for SHA-256 a939306b924d2852…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 02:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44c205702d2c951ec96a782308060887 SHA-1: 0d3c8357cb220e2b85b75fe5683529647cb81c06 SHA-256: a939306b924d28525043e472350444ac8099e1946e1d09a7b5fffc117d865b6f
112 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of link farms suggests an attempt to redirect users to malicious content. The document body, though heavily obfuscated, likely contains the lures for these links, such as urgency or download prompts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=build+apk+with+expo PDF link annotation
    • https://bisnismedsos.com/userfiles/file/motinebigi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338fa809386---mosafinifodaw.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/zavikekimegolij.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df28ed6709---mazibowafop.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109121735344837.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/2881394285.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f970644160---zezomebisalogupozenoforel.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161303d276c934---sumijexokojotefidixeted.pdfIn PDF document text
    • http://wmsone.com/eimages/file/lexazamuwo.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/xoxatalived.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/64422669270.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/61100975885.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/38578897106.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130749757056---dutumuda.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/32502464359.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/42681970397.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/wamusabepani.pdfIn PDF document text
    • http://gr-chem.com/upload/files/17197782267.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/kemam.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/41481447238.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/tujebozumuzegevenaradizo.pdfIn PDF document text
    • http://logicamail.it/draft/media/65629902535.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/77352620560.pdfIn PDF document text
    • https://halkum.rs/files/zilaf.pdfIn PDF document text
    • 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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 18500 bytes
SHA-256: 33b6109e2a57c0c585e4c79f3d69e2144f1f3356915400cf89aa5bc9dae0de15
font_01_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 10552 bytes
SHA-256: d1a42bff74df45c23343a516d7240b0682f981cd8fd97fab8589cf9cf7897e6e
font_02_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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