Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07ac1d707612a45…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 16:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad5164d965c3842d6f4598d5b49e6b5b SHA-1: b6e071ebaaa215c5b0419686b43cff744a9ad9d7 SHA-256: f07ac1d707612a454d0f752fada2447af5c61211e20f5497fabec8ae425faafa
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0af4545b59---lusubokozesikajuleropaki.pdf In PDF document text
    • http://radtel-sport.pl/userfiles/file/pevutorudulolowir.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/xilumupi.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/81478696629.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/kowulogiwudabupunejap.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801eda13e42---devabivipomi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3144b8e8e---femilukowetapu.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/nenusujugumiroxon.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/mosunajudarekoji.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/887d8af95a4d99ee57a981dae8f9de58/vibojosa.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5vtik3rjj29tseob8c8uihikq7/fejunesejoxurawu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1612184d165565---gudituwubegezorek.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/18937145532.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2455f95030---98815760516.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/supamuvekunazoxapapajejoj.pdfIn PDF document text
    • http://infunplastic.com/d/files/18794042387.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/sezelubetepumojifejazab.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/60753473023.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/51774906831.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/764f67f36402cfb791c6bfb6fd7cb72f/17807890496.pdfIn PDF document text
    • http://ccshecea.org/upload/files/nawunuwo.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/jonasiwunetarafelel.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/63719676311.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/1155385607.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/51412136502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=variable+expressions+worksheet+freePDF 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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 10844 bytes
SHA-256: 7ae15eca0ac4033b4ae3b81d38b816884590fa6734687e9d98ee3c25492577ed
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 17380 bytes
SHA-256: 507a5bdadba076d2b3bedfbdf2e4d804ef0f10ba55801b96baf5b4751354dd59
font_02_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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