Malicious PDF — malware analysis report

Static analysis result for SHA-256 a443c277ed2201b9…

MALICIOUS

PDF

99.3 KB Created: 2021-07-03 00:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 10907e54e7133d2f6480adddb4fc1585 SHA-1: f71e6d6d18ed45500ff372bb86d2784e33be6579 SHA-256: a443c277ed2201b97a3412278fbe788494e84daf1cd2db3f8a9747165585af25
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of a link farm on disposable hosting and the compromised CMS upload links suggest an attempt to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e355bd1---tipawugasinezefanefurin.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/um8eqdrk6fefq4eogu8p2l18op/12781191578.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/dujatavosag.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/56e1bbe3e925a8ce2178a8cb154b864e/fojewokuwapabimokezegis.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609869cc1517b---zopozewororaxulurijiz.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/sugazumopinugabowupo.pdfIn PDF document text
    • https://anfauglir.com/images/file/sezinolimizujogajesabo.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/20174091449.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a40961cb6---61062522239.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845a2973bc8---mowafebosibubug.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160813d6b7fc2b---lemojimesonufoma.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607991595e39a---46356948160.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/8442146311.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ff391e7c0a32ed06492448ad06f6143/xuwurekaxufenoze.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/71630207516.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f99e1382bf---wabemadumarekaxikasi.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de8ba1436---1448089796.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/bedifelorep.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/60093953340.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/br2qjb6tavqsucourun1vt411l/pojujejuxexagurij.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3229906dc---32998120814.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a2586be920f---lolefirirajidejeruro.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/99c96a235dfeb91785ec01549e2dd25d/wagefikaz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lih5kk60ptifhikjh4s1v1e196/79800518789.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/xomimevunamafuvoxana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=swift+array+string+joinPDF 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_off0000fba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 29976 bytes
SHA-256: 4c56808b34ae85c268a94abdf4692e3fb1805353a37a73290a1e7b41c63791e5
font_01_sfnt_off000138b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B4 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_02_sfnt_off00014edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDD 10616 bytes
SHA-256: dffa34a5a42169833b91cfc1d13bb619e1b3e12485429458b31c2760d08b923a
font_03_sfnt_off00016747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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