Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52c7bb50920758c…

MALICIOUS

PDF

100.9 KB Created: 2021-09-07 06:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57638fb27b22c62cee92f0849932b826 SHA-1: 69fb6fcf6b5354c8f653ba12e196efaa9c803ebd SHA-256: c52c7bb50920758c826cb96a19e8a0124d4300818dded2254d27041e42c331e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution suggest it's designed to lure users to malicious sites, fitting the pattern of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cleaner.pl/userfiles/file/3509338112.pdf In PDF document text
    • https://smsenerji.com/resimler/files/79232131553.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/67989326886.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d53a2f8a---33391575407.pdfIn PDF document text
    • http://camwater.org/media/files/24051387747.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07d4d8f2e4---tenow.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021061706143999.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/20109167330.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/87328881925.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/wanibatokedafifiwevipuf.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9gor5iub2ffc29ncmrqsc154e8/wogumopimofenepalami.pdfIn PDF document text
    • https://0900107678.com/upload/file/34380001538.pdfIn PDF document text
    • https://menu2uplus.com/images/file/lokodibewemilimagosirag.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/xekimunemujisizigu.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/zolorikeve.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/81860877120.pdfIn PDF document text
    • http://nscenter.cn/upload/files/92970675033.pdfIn PDF document text
    • http://ropesadventure.com/d/files/43140512983.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b810c98274---91435987367.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/24443296486.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ed7207ca---jilisitupawobodemisemim.pdfIn PDF document text
    • https://haidangpc.com/contents/files/84593752614.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607104efed156---57062292375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=amaurosis+fugaz+bilateral+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_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 11016 bytes
SHA-256: 8fafb63a6b6716938fc677bb652917d3e9369e4b88ee1d61b87399f303a0778b
font_01_sfnt_off00013e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4A 18304 bytes
SHA-256: eb2b145006277ee864d2b5130ae514f5afc3f7cd6dee062e28df1269da768799
font_02_sfnt_off00016dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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