Malicious PDF — malware analysis report

Static analysis result for SHA-256 606554ef121dd9f8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 16:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 008d4e57d44b533b27793f0a800cb2e4 SHA-1: d713a10a0c1be7ed1637f1b92eb116f1868a4076 SHA-256: 606554ef121dd9f8428d6988e779e6e95e5086738d1f86e6efabffc024669202
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by an ML classifier as malicious. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially malicious content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://catamma.ru/uplcv?utm_term=multi+step+equations+worksheets+grade+7 PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c192694c816---94309608093.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609441d689bb0---80563314807.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/63f511c8713cfd09d01c6cec1d1794d9/pepoludamuzosafutiweb.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/30146048562.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/54509891631.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160768c623d95d---83746896136.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070de8852c4f---17534554074.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/4813895626.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mtjglkdsaflgrj3nhb8sfdb354/69955648749.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/96e23f784aa9da93996eb696453c51f8/10728878471.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/kirarogiw.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/lasojaxalajomuge.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/37034153830.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3812ba191b340470bcf4ef79732f6c2c/88719548624.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/gofop.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/susepizesojilibi.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/tozavularujumiwesiji.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/gujezerebedova.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/2876569196.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d0d586db---36232459771.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/banuvejove.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/47804920109.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/88612248201.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/ab74cf64ea95ce8d8781cde815979fb0/nixepot.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/61764942383.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_off0000cb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 11136 bytes
SHA-256: 5cc3ae03eada4d0d812374aa759e25ab333d5e4a7f8832cf40a4191a08bb6746
font_02_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 17028 bytes
SHA-256: ff8035c9dbf0424ee88edbc7133198d0f6b6953e914cb256d3c515bdf629fe21

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