Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8656aeef3ec2f96…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 15:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47e29be74a7d0d9a757dd2c264973437 SHA-1: 0c53325de2199a62826a77fad87a8f3e7a979c9b SHA-256: c8656aeef3ec2f96b466fcf4c83c6d0dbd908e324bc2047cfe7ce6236f2cd97e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.deewanalarab.com/up_imgs/33815364286.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dsefk66nqppmsff2kkpp1oak7/fagamebapavipipuwex.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111e07ed8f79---tapuvuzirizitagis.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/nisoresumubakuguvupej.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/dakizipe.pdfIn PDF document text
    • http://0048.pl/48files/file/17457228381.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/xikupoto.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/bivemixip.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee429998480---83326459448.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e637ffc4---gezakuvid.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/87020944012.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/wabete.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/dd0a0aac038b9003d80e676269185684/vopexama.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/8i0pslip6kg1sjv7692cl1ndot/zumetarufafuwema.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/93211676571.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079831c2ab78---vexivaxonef.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/fexuweximuwonobilok.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080db284addb---gifak.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f0f7de710614728d15e9eb4328ca991/livororoz.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/figanojozegatuga.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/61008432151.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/36140657643.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa80ade0ed---xadiw.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/71576581697.pdfIn PDF document text
    • https://naves.cz/res/file/84002833028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=histologia+de+las+valvulas+cardiacas+pdfPDF 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_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 19972 bytes
SHA-256: 923286f7403ae20c34818910dd248c55cf70af5877b90e04877d29b6d585abdf
font_01_sfnt_off000122a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 10848 bytes
SHA-256: 8dd51f16e4f31a3c866bfcca4b12778137ef1c9e7721e3f1235bcf272ee78ea7
font_02_sfnt_off00013ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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