Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e691ea59b2ccfa3…

MALICIOUS

PDF

70.1 KB Created: 2021-09-07 10:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3073ec3f1055e227feefdaef33b04f8 SHA-1: 4894af99df0b4e545c7985892441a3ee82d302ff SHA-256: 0e691ea59b2ccfa3264cb5b52c531b47df2597bbb6f70a831fd1179afeb153c1
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links to potentially malicious content suggests an attempt to lure users to external sites. No scripts were extracted, limiting the analysis to the URL structure and document heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fixafilm.se/userfiles/file/98320137852.pdf In PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210804_1D4AB886D5CF224E.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb871c8fe---votaworalumoxojimofi.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/81048264162.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a16fc0548---58511841049.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///kuriserorixesusixowo.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/62171500199.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f3cda2070a5434b8a10d0d50391dc39d/32867236349.pdfIn PDF document text
    • https://12shio3.com/contents//files/fejofimozuxixi.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/44862325088.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1115b0c89---diwabimav.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/aaba9620605514e18e93646482761347/10775731326.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/zawesewet.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/19007396411.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/45782194966.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/malabijimutemowase.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5d8c446d107e5d185d2df1009b6b8b1e/nepobafune.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/kuximudoxiwe.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/ae8823a0eeaab843d832736b65a1c76f/12409307748.pdfIn PDF document text
    • http://www.bandungmesin.com/file/tamuvikigodovoges.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/69984489540.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/visitozowerese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=irobot+roomba+890+user+manualPDF 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_off0000b164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 10864 bytes
SHA-256: d3e2b6ef2f184bbaeda44d087ced16970888ad366593bc38010526dbf098f0f2
font_02_sfnt_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 15752 bytes
SHA-256: c75f3d1a1c3705a9f93e53600db045199ecb3a0c2cd8032439ca02f86f098525