Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cffae7c2de6eaa…

MALICIOUS

PDF

87.6 KB Created: 2021-07-23 07:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 981f25619d79284dac5fa145836af47f SHA-1: d86988c4eb76ad4d916d8e6a74788086afc82f21 SHA-256: c2cffae7c2de6eaaa4e7913f6465bd9e49b17495877a954910e40ac6f68ca181
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on potentially compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://anhuishangbiao.com/upload_fck/file/2021-5-19/20210519093804711653.pdf In PDF document text
    • http://jyotiacademicpress.org/uploads/file/46701123989.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/zobol.pdfIn PDF document text
    • http://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/33665195152.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/jixozusudutuluvibejunum.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/xirinokusenidanije.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a444b3fc---pabikeposulazetimedida.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/43gqrlpmk7icm6rfoassn4sfq0/xujadesewifup.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5f05a36f5f0072692bc39d36d239b8c0/musowilubip.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0e014c55---zonekesivelozogabi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3974d0126a---fapulaf.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/fewedowezifedonokav.pdfIn PDF document text
    • http://fygl.net/uploads/file/020935098520.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab428b33338---lujaxozel.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/25588986603.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/bulokujufofigunajemavup.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cda202591---labixanuxodezigev.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ql7sc94b3horffpit6vodomlle/34517926290.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/8005822576.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc39faef70---40527262919.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gekoxogaxorolifedaleg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kcal+to+kgPDF 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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 19836 bytes
SHA-256: 385fdbb600459bcc2926de97fb246733bb03da3108409bf8ab0b3f163ac5fd8e
font_02_sfnt_off0001313a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313A 9892 bytes
SHA-256: 1aec6bda1556502c15c162965b634f31a2824f5a1d579a474f76ba581aa72a81
font_03_sfnt_off00014736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14736 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

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