Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde357a5e2e5ed04…

MALICIOUS

PDF

88.2 KB Created: 2021-06-17 08:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6a175a45fcd9684ceed460254b89210 SHA-1: 1249a02670449ee5ac0ad30e2790ab45d8f229bc SHA-256: cde357a5e2e5ed04498f9a6ba25e42aa298633f9ca24445caaad40088b7bfe6e
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure of downloading a malicious file. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=standoff+multiplayer+apk+download
    • http://driver-jazda.pl/upload/file/kozuluverexi.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vggqbc5lmgp0qfe7pu8c2vkb64/63498962226.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/121f32f21a7271aca393124290662cb7/71811362354.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bbfc7662---38386009370.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1525a8b6---bugidamusavepo.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073670c13a5b---fupemoruwuletani.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8bc31e8a1ed2835bdc8297581515f2c1/14812603359.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c46f37eec69f460720931339c5ef9750/luviro.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/755318b0fefb86296b13eb152fc23dcf/4865724750.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/faf3d5372c8ed31d1806b7e0cb37400f/purubawogaragufep.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ouqh7edkc567av8qrd9p2k8rf6/durufimewez.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe6acd63f---fesabowadaxaravikujelujax.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c5aafb3b3e22085f4e112537e8320fad/35779743442.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/62047cbe6927b73254056f1de676dc2a/85860038145.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f63b910e9---38318266370.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6cd62b193---24170029105.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb1.bin
634ca227b8128c8fb2202c924dfb845c2ca0106aa76d526ea4269f2028914971		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 6056 bytes
font_01_sfnt_off00010470.bin
49fdbdc4452f3ddf66c921e0aed7817f86cdc240b9ef6da88d3805e1883e7d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 5372 bytes
font_02_sfnt_off000116ba.bin
ebb1134c3e937dcc13abe790a453649203d3f42b1d1c81917dd2bd18029d5e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 11688 bytes
font_03_sfnt_off00013e5e.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5E 16092 bytes

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