Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fb1d6e89ea99d7…

MALICIOUS

PDF

131.6 KB Created: 2021-08-16 21:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 8bd756ff6fab4fed14f442bc9b9afb08 SHA-1: 20a1992a66aee21335ef8ee3ceac084d00be47ec SHA-256: c1fb1d6e89ea99d79b723b5df5704d4b98c1c8fa8ddbdfb3d3e99f4430984095
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9759

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d00400f7f---17813745813.pdf In PDF document text
    • http://ilovemynewstemcells.com/clients/865932/File/30931216679.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2d715dd5d9b5cfe335176b3dde608612/fulolasusifasa.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/fugekamuxesunorixemojo.pdfIn PDF document text
    • https://rosycaffe.com/file/6161142723.pdfIn PDF document text
    • http://slsnn.ru/content/file/fufop.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/nizularagaredupawapajid.pdfIn PDF document text
    • http://parethumukalchurch.com/uploads/file/nevomililefikepato.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/guzubawazilubekawiko.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/kapoxiporodovunujo.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/16186285997.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8011bc08b280622a5ad9fd020cb9d346/86819210629.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/werotu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8108751490---gosotutaxatoduji.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f5dfffae75cddb3ef590bf7ff10f5018/xisadomabudifimemujori.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/834eabbd2c8e9d658308cca9951bd39f/99205390531.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/jotagi.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/9018377334.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/d8754a16f292f05c9d4f82c78a28443b/senopixupevufivubo.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05098290e---wunonozagefup.pdfIn PDF document text
    • http://moristas.com/userfiles/files/89524573068.pdfIn PDF document text
    • http://rld-carbon.ru/file/56563134260.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/74726460683.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/286703f4f7e928c8b6b76c73e0a83d7e/nusepewojawisoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bonus+code+for+tlauncher+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17659 26352 bytes
SHA-256: cff72c279b853fa625f52e43facb1b5af019f2a881659681bd29f3105bd68640
font_01_sfnt_off0001b86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D07B 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off0001e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5F5 10876 bytes
SHA-256: c8abc2d572498e9ec9a573f3842c7eed6784b69d6d30bbae3576d91a6d751276

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