Malicious PDF — malware analysis report

Static analysis result for SHA-256 170a1d8248ea0cc0…

MALICIOUS

PDF

83.7 KB Created: 2021-08-20 02:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2d7079216b7f0c1815a6862256cd324 SHA-1: 239da51863f48bcb2596e25954f26a4c09f26a73 SHA-256: 170a1d8248ea0cc00947c69a21a27a1f6b8485ff1de11944b39c8a2f8154782b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lead the user to a phishing page or a download site for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=tintin+comics+pdf+in+hindi+free+download PDF link annotation
    • http://enjoy.sk/editor_uploads/system/files/pataretilobexodinosi.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8af5181d81797943590cfb64f6fcc6d8/88698821299.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/56481802898.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/vudugegibizixoba.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff745087550eb5d4c03766f0035efb8e/75154973654.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/78763906606.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/25604922681.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee6ce78cc9---7129485474.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/tudiwamogep.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210621064940.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/17949670614.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/venirovoruzowejotorid.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/941689c8eb63ec2d4bde8d468af7ace9/kiwoserulosomodali.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a020286561f---18564724152.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/fojumemevaxef.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/dumijotutuxutugoxozumuwuz.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f001f506---14302465801.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/53415049296.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/notuwe.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/13061421452.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8337076c75---nexezigumabaferemefezuda.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/6144863851.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/99407448265.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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 17428 bytes
SHA-256: b93cdbc53e32f4ff1e98738c03a82fa814e81e24b04db81d2143dd81a1eab89f
font_01_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 10932 bytes
SHA-256: 6c5c38e443b75555b61c784d335293eee3da7825152dfc36c60a87c75cbbefe6
font_02_sfnt_off000128da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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