Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd481849b418184…

MALICIOUS

PDF

98.1 KB Created: 2021-10-11 16:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 040bcc712c238602883ac58518ac317e SHA-1: b451eaa8ac9c52dcc147b8e601645d8625c74843 SHA-256: 3bd481849b418184ed296dd8e3c980876df9b3cbdd3a21020f485d8e98f4e7f9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://architettobotteonpierpaolostudioabacus.it/userfiles/files/54254846744.pdf In PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/xixurufemopeza.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/xovolipalubowenepomer.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/femelegaliba.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/89746464015.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/36297520715.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/28842772915.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/jixexuriferedo.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/mekovelifefovowatodedu.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/zejanowolozolatamubejapa.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/65044291010.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/75891167938.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/37449615992.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/75082837066.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/97569846442.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149f5b9a0e9f---bozibanovaxixiledijasudel.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/60176880536.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/2531586703.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/62695612400.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/46673706960.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/65219251884.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9a224c571b3fcb96f961e9a1b75f38a5/tonibuzekigatemuk.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/31271784576.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/87427400055.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d8a99e2bb3---59675106128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=if+you+want+him+come+and+claim+himPDF 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_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6F 19852 bytes
SHA-256: a754dee327e0525783bf9f38ab7d8f939a0f821a1be0f7115164f7b7de05564a
font_02_sfnt_off0001620f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1620F 10724 bytes
SHA-256: 037d0bb79fe8d75b94ea61c245a84e92335538b74b515ad3253c3acc4dd1895c