Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a70ab00bb62ac63…

MALICIOUS

PDF

102.7 KB Created: 2021-09-02 12:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 666285caf731a4e61cc5999f1367b177 SHA-1: 4061da2b216c27d19ab29368875b58f5b9b9a2ac SHA-256: 5a70ab00bb62ac63f48c187da4f1cd2b0f99487191daf93ae6e38cb2af511a93
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a malformed exploit stream. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URLs indicate a likely phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160861278ae664---sopupozowuzarov.pdf In PDF document text
    • https://defaico.com/d/files/fadekawotimuva.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/zopake.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160845dce67659---63823868293.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/bewafadatopo.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/96535700428.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/fizelovosatabefusi.pdfIn PDF document text
    • https://digireg.org/upload/tuvasavetamisurafonebaxu.pdfIn PDF document text
    • http://cartopack.be/Images/file/30514588183.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/8552659026.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/daxabaligepabuler.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/jupejid.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/29430346825.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/rotus.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c0df13d3550e4563c2f9f6e2056b68db/jixiroduvegosexuzubapalus.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71323f053a---moneketudiro.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/fffb77492acf3b6e572c7e3d4508c365/mosovezagomulafugaf.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/xixudunegosijesuvizatir.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/01aab045b760879dd925694acbdd7073/34409865544.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/628358861.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/xusetiwexewome.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/tikivezuzamufa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/sagabijotarazug.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/kevomubuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=codigo+penal+militar+colombiano+pdf+2015PDF 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_off00012b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001437d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 18416 bytes
SHA-256: 173d5a3f672ed932b8815d49e1dc8c06a3ea134d9fc7e35229081488836dc582
font_02_sfnt_off0001712f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712F 11396 bytes
SHA-256: 8b190a0419d65dfcdc95f17235d36b035125922044903559c345637a3aa78c98

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