Malicious PDF — malware analysis report

Static analysis result for SHA-256 31053ca6e7db95be…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 06:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0fff0527e93d794d7ff916c87b4ee8d SHA-1: 7091d734fb84a94abdb546c7aabd368c06024fe5 SHA-256: 31053ca6e7db95beeb202a4a623795aed63e0d3c18697ce97fdc4b0320499fd6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to various compromised websites and disposable domains, likely to host further malicious content or phishing pages. The presence of multiple external URIs and link farms suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=lennox+ductless+heat+pump+manual PDF link annotation
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/vuxafukexozawep.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35741c75cb---revajadisajaneliwib.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021072200552224.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7b0665d3705f3bff2bfa8ce427d546af/79018497854.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070231735ed3---jadalugutatunalomo.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/biwuxidagekadefegap.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/79010594541.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/vemibosarasawudemilom.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/wifaxomusobov.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ps5omhr4jgkcjact68lpoad9p1/papekipusenarokor.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/wuzodari.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/bixorabakeparezo.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/zapid.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/73381240f005af2d03839633752704ba/gopulozadezojunibego.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafaxevuvokenupide.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/75053575471.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bbe509fba00a11323c453227cf434d96/xewepil.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/repogasulaniv.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/40aeabedc4af3fc391dc00c02ca54c0e/91233448228.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210627032840655.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/vupabagito.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/02qd3cffv4hruir5tmfqkiaugl/59727387462.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4b2bf112---wofivuwenoveg.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/84694423872.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d1753ea58---58313522168.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_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 10744 bytes
SHA-256: 32d1c0ac6d2a1e050b7f7659a04e4f47b4e56a4c8ef33ec1873d6f9e1817ceda
font_02_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 17404 bytes
SHA-256: d45ddcb588e229265dccbbe7a86aa288b6eccdedce3015327694532be3323ab9

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