Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90b39095a621e1f…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 05:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a281aa5f3b552add74195e8f6eefacb SHA-1: 142e0da563e828e2c8a78cd7e6ca770238e13566 SHA-256: d90b39095a621e1f0b408b6b41ef2dd9f2a748463714d4d19dba7c64a0596cff
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to malicious content. The document body was unreadable, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://ombs.ru/uploads/files/vaxumudazidap.pdf In PDF document text
    • https://thinkhigh-tech.com/d/files/dibasezedusoxigomejageko.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20ca877b4---88315498655.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076986f23593---wexunoboxiwonematilenifi.pdfIn PDF document text
    • http://capital96.com/userfiles/file/84931970888.pdfIn PDF document text
    • https://andrejc.si/files/file/wixufogorozerebelama.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac2377917---92826000237.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/24811364219.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kozalitugatepifi.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/sogunosap.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/45845920451.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883a61ea36e---besoxiliz.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/89205724919.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e3397f1f739803c334e97a003b23a945/2215226278.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607260afbfa12---mofejepifafiti.pdfIn PDF document text
    • https://rcot.org/userfiles/file/71360215173.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7007128914e94a2f10b63e6382eeb2f9/tolesonovataxe.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/tenexemidexuj.pdfIn PDF document text
    • https://tch.lu/files/files/nonakatabumelumurebi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/32230301407.pdfIn PDF document text
    • http://surtek.biz/image/files/20150126_094523.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/49433517355.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6d8e1bee7---kinilefopal.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vivanosiz.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/zopar.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161157327cb3de---98430991025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=intrauterine+growth+retardation+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_off0000cad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 17480 bytes
SHA-256: 06641cbc9ed18a8c4e8ad7669f642a5cd791d68218e2e596675f669597119be8
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 10700 bytes
SHA-256: dbe79a9669a833e7d6ee2715d433fb77730438bb033a8f48f77b241c2765b60b

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