Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8e9786e325c44d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 07:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81e9d9a802e308ea48e3c2dfd4ee0661 SHA-1: ea71926bb861e7219d28e25099a68c7da4ab8f23 SHA-256: 9b8e9786e325c44dd715505c98f476f61006f2c37644f18618d5d1bf5af74820
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://inwebjor.ru/uplcv?utm_term=lpcb+logo+pdf PDF link annotation
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/uu1n81o62jaditm92cik6q9k91/87312042903.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/21dc4667069bc5cbdbc8fd8428765366/dinaxukomuzoropepa.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129b1b32075e---82913960883.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/33350579066.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/84962609861.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/zilopenejaganepigupuxe.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8175iqv8llp1ppfoadav65sd56/94200239013.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/691f50f1ddb70174004cb9fe3fc18a76/35780860212.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d4d56a9e3af98a81f163dcaae408c3b5/taxifolakobexalave.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/vusedorexosefopobu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/311b1adca03cf33c4190895fe498f6e9/32804629977.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/sivunoviduzuzerisomizekir.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/22919653691.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ade71951304---71386559764.pdfIn PDF document text
    • http://weingut-suppan.at/files/18966530876.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607da19edb196---woregufamovofepa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610899dc91a82.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd87fefa0e---52512265558.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/13274402847.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a812b3c2d23---45256818469.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/52053709490.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/22822592252.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075dacf8313f---nofixopa.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/fobaneregimofex.pdfIn PDF document text
    • 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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 17656 bytes
SHA-256: cb006ecd16bfd603d2aee82bfb1042315b50594c320d6b9279391ea120cde96c
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 10036 bytes
SHA-256: b80ecf4353ed6a2a71503dc6f6799cfc7670658cfb7ae81b66151f9f35036335

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