Malicious PDF — malware analysis report

Static analysis result for SHA-256 2580f3c6dbc86a39…

MALICIOUS

PDF

89.8 KB Created: 2021-07-31 19:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3223b6f9c69eec95bb3927d63cc8b64 SHA-1: 6e16374998cfe369ac16e3608cb62f605706f441 SHA-256: 2580f3c6dbc86a3983ab55b15cfc2650349eee6acb4462dcf7e2b4d60f788043
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://wietsevoermans.nl/ckfinder/userfiles/files/98490729468.pdf In PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fovuwarawovo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071657292dd8---29477007966.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/lavelarujowoj.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a540febfecc---wejureta.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/57734691940.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8699d87faf4085adfe3c7e111eea14f0/samadojijugorib.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e136097a7d3d2c8fd469541efa10065b/27161946617.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/sitemelugosaw.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/basijubiratedome.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/74415943451.pdfIn PDF document text
    • http://newo.ru/files/files/26075236194.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/033253a5355fb6e1bf5f15173bdaf76f/pidukenivegaba.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed4c05dcbb9---65570375085.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7756edf98b2daf15c3daea1048ce9a50/4067973810.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075c262c4ad7---dujefodusop.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f973cdc8c---12462688695.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/15218785175.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/85409290373.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/004i5nenu8floi4p4fjbbf2ie0/nudulugo.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062414054273499.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bede9b54066eedd303b69a3cb199f01f/8946397569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fda%27s+dissolution+guidance+2018+pregabalinPDF 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_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 11440 bytes
SHA-256: 09ffaad8fc7251b498109538cd1a27dbf0efcdd343210ac43b2431e60d6d12d5
font_02_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 17036 bytes
SHA-256: 35c3f9eba4b47dd5ef3d02f38ace37fa38a2e6effa5bb2cc9011e8e9a0b02766

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