Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d5896b8ceeef8d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 10:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b733dca3508532e61bf5ff5ca24242d SHA-1: 19eee691f7450b1d5598a1b8fb6cf7cad1b06187 SHA-256: d3d5896b8ceeef8db29716824192048971723f5b1d90a3e65a0b7b342f2fbfea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=pdf+reader+apk+download+for+pc+windows+7 PDF link annotation
    • http://dges.in/userfiles/file/kupunebizajar.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/vorolabinafavajubo.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210906_691EB3F4290DC152.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/87246623477.pdfIn PDF document text
    • https://datawire.gr/files/files/zaxibuju.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/51658255636.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/34875850719.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/94781293644.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133002c5cf2e---sorukanibufoziwawano.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb640d4ee---lugazufunifaval.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3ad49a27---lowinire.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/bufiginoviguwedakagane.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/41489770296.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210912_1851F112485463BA.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/70630612635.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210912_235814.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/84835370553.pdfIn PDF document text
    • http://oris-am.com/editor_up/63530882495.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/93134129365.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/nuxuvojimeruxi.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/95721567553.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/20oqkjlpnpk664vv61q5qf5s87/zerobofisaxolumisevezadi.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/86277195773.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_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 10744 bytes
SHA-256: 8b07f8f8b3493ab0bf39fb73795732aadb8ca05f8b623f827d8dc1d849793de2
font_02_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 18624 bytes
SHA-256: 77fcd9fb8449116207134ec78a15e1958af9d058a7d83726b1eea5e7e7c70d3a

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