Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb3df6f5dbbcf21…

MALICIOUS

PDF

101.1 KB Created: 2021-06-26 23:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdf2234d928e7fbbfb1a6bcb2abd8d75 SHA-1: 397efb829f6f51cdbaec41df4b35d5c319d8e034 SHA-256: bbb3df6f5dbbcf213017ada8d755d229302dd1a7e4a113101dbd3df8330de047
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs point to compromised WordPress upload directories, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca81518f78---nomizodijejewine.pdf
    • https://juvelyrikoscentras.lt/Files/file/valavirikedujevujusozo.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608031ae049c9---46716648117.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c7bc94fb6---39029337153.pdf
    • http://vencedor.coop/images/admin/file/vodizuvimitazi.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/jac0gvu8f6lphckjoflcbid0i9/8154599531.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/7ba1326fb4a4a71b3e2c63ca25ecae59/55054623720.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160782d3a13c05---paxuketakokat.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cea1a7c1c9d---77812957784.pdf
    • http://immopolignano.lu/images/12952365352.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/efb88af35b8d833d1a001f4d9869ddde/davufawovi.pdf
    • http://bularz-auto.pl/images/userfiles/file/81309675424.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785c8e2799b---59340927932.pdf
    • http://bilmatbasim.com/userfiles/file/ritokonomube.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084c157ce25b---45219454188.pdf
    • http://ajivikafinance.com/userfiles/file/49218145475.pdf
    • http://vidol.nl/userfiles/file/11833049490.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c875d6669b8---gepufokovivuwexabilegegex.pdf
    • http://ipost.mn/ckfinder/userfiles/files/94571122948.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95931b2ca---76622004773.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084e31caa100---79657201501.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608994b36dc6c---wimugenebimumawulax.pdf
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/86781841119.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=neighbourhood+meaning+in+tamil
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000dc69.bin
97408a17910061b62e5b0d31918ca0392771d174b65642c0d6e29dc40ffd47ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDC69 20204 bytes
font_01_sfnt_off0000ff9b.bin
06ac04fa52a5290c95b1366838f0df60a44c236256aa480140ff296486f03718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 4760 bytes
font_02_sfnt_off000110b8.bin
dbd73fb6499b5071907729c09ed0bba7bf5c8d4074f5eb2eb02293e5a18c7a88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 27728 bytes
font_03_sfnt_off00015378.bin
eab28f5972ea1cce67addbc69b1063be2b3b65819c7340273370af9fc999f92a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15378 10744 bytes
font_04_sfnt_off00016bb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB3 16792 bytes

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