Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acdfeabc183ed41…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 10:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dec75e244005b0e324ccae28ffc6f8ee SHA-1: 86151abbdc8383697b70bdc881b6ebe2019d97f3 SHA-256: 4acdfeabc183ed41bc9859a4e7f14bcd14aff5ef16857b1fa33421a48243911f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs, many hosted on potentially disposable domains, supports a phishing or malware distribution vector. No scripts were extracted, but the structure implies a lure to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://area5srl.it/file/37020155434.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2e758308c---5128330240.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/rilegofaxamen.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a490492e2---73815870320.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b61ff1e8a06---medanikufetodotuxiku.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/fazetikexularejereliwero.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078595743580---kugedotu.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/misiviz.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/dbf2b8cffe435909800be4f16b781bb3/gikomepobuxabe.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de489668baf---gorul.pdfIn PDF document text
    • http://peoplefoster.com/pliki/40429659659.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e5a01bc5f---fupomutesadazadatepowuwu.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/nepejemigijujagudasiw.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/56396293904.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/wofidogatifowitipuzupe.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0mdvg227j0disd0bmq4fjkcs2p/kuxesopitimukuwa.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/cd80fa04eb20c9a3a9cb2ae981d32f64/81358426381.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/nawapeluvumugukevuripaz.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/wozawometur.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/fijelunabobetaragew.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/lovareritisazirugeduxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ellipsis+and+substitution+exercises+pdfPDF 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_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10936 bytes
SHA-256: 89a07de972083ada7e0888af14ff31c6d5f0c27199c7660ee6e50ac33efac413
font_02_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 18740 bytes
SHA-256: bc45e006ab495728bd65be2a2d7e80084f2b3cceb4b18be6a2d706074d03b57a

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