Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fcfbfb143f7be4…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 21:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae093c7fcbe47dd131e5205423b9123b SHA-1: 93bdb39f0c522680280b9440c33bed03e358c15d SHA-256: 75fcfbfb143f7be49a734b1d10d2a09d204efa2c5e56364d7da1966efe44e890
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with compromised content management systems or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amadesafar.ir/basefile/amadesafarir/files/68275173183.pdf In PDF document text
    • http://sten.kr/club/data/userfiles/file/20210910100543.pdfIn PDF document text
    • https://ever-progress.com/upload/files/giramiget.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xizosokitimemitunanad.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff06bcb433---malobupe.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/wepudiwomovo.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/516b1ac96b33e46fee9a59b530a4f3aa/52876375203.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161318ed0d7181---ranodepoxarobuzife.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/51714282329.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/74771035891.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/32144662445.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/21800165609.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/29022994069.pdfIn PDF document text
    • http://agro-partner.com/Image/files/66632613228.pdfIn PDF document text
    • https://granitnet.hu/editor_up/15107955146.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210917_A8265BD4BFD05C2E.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/40140098776.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/30997275421.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/17858862493.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/pokowubilug.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/89441692968.pdfIn PDF document text
    • https://mihalex.by/files/files/mabibuzafasemuj.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328fca8de08---73238799193.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905085838702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=silver+icloud+bypass+toolPDF 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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 17708 bytes
SHA-256: 27ac2301e767174aba8898ab525c86060ce1f09139cddebd7bb27dc04b020e35
font_01_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 10900 bytes
SHA-256: a2f394b8500c05d571fcd669b4190d1aaf38c1c81c7a719c36e094a1cecaf20e
font_02_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1