Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53d499ea13f3d1c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 12:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1442c69b94d575325b6a627a6d421c2 SHA-1: 38af037ba1103aeaf0f52f64cb554ccb0c688969 SHA-256: a53d499ea13f3d1c5cdad0349e1a1398cd1aceb8f446aeebdb33e21af9698de2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting it's used to distribute further malicious content or phish users. The presence of embedded URLs and the 'link farm' heuristics strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tuning-zone.eu/userfiles/file/42324394732.pdf
    • http://aylabawadi.ae/userfiles/file/pimogixoj.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9808150246b752d1d6e3476a2c253263/58457940918.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4e980ae07bdc5b545a82bab188b61666/59299301730.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/13515139624.pdf
    • http://sonnenheizung.ch/fckeditor/editor/images/file/50354661324.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404756084a6---gawepidarovude.pdf
    • https://performanshost.com/calisma2/files/uploads/xisalalurivarosapipez.pdf
    • http://walosports.cl/userfiles/file/rexukuvebedixu.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210903_8F5B52AD19138A73.pdf
    • http://servmed.net/userfiles/file/metobuzomuvu.pdf
    • https://charterboatdeliverance.com/uploads/files/vaxudasudoxeter.pdf
    • https://southwestlooms.com/admin/userfiles/files/86970268193.pdf
    • http://casier-a-bouteilles.com/file/kebavosugotebibeg.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394d364a2af---nuzenemon.pdf
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/23863753064.pdf
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/wugiz.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/76293432923.pdf
    • http://shepardinteriordesign.com/rw/upload/file/baloxuriwigemuwuv.pdf
    • http://sipzip.com/userfiles/file/putetuminokekurix.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/715e7afb1a4d306c08c2f925c72ed44e/meboxemuw.pdf
    • http://francescasciortino.it/userfiles/files/44759578771.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e260340e---wagadibuguragimifi.pdf
    • http://syuncyoku.jp/upload/file/96973293304.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=avatar+full+movie+in+tamil+watch+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 16792 bytes
font_01_sfnt_off0001045b.bin
365ad20b80179f4d0306ecfa5fab4a97ac507afc95bf2c4a7c6126cc18d208bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 18372 bytes
font_02_sfnt_off0001342b.bin
02693513beb0e626d8e96fdbd01d45a3858ec07a424261abcc7b4ae48940e088
pdf-font-stream PDF embedded font (sfnt) at offset 0x1342B 10668 bytes