Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5534955c10fcaa5…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 04:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 214ffefc413b366b7486655a6421807a SHA-1: d2ebb98f67921691a39b25a120e00b4d4834476a SHA-256: a5534955c10fcaa5757caca7060341dd11af87885c4ba1814373159783f00354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, hosting numerous URLs on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it's designed to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://publicbridge.pl/userfiles/file/42050513503.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61b235e2ab---23841520978.pdf
    • http://scro.ru/pic/file/54506609542.pdf
    • http://jongauger.com/ckfinder/userfiles/files/88417360312.pdf
    • http://madang.eu/f_pds/fck/file/62893223231.pdf
    • https://zifu-tech.com/app/webroot/userfiles/files/16921783436.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e89a9b27.pdf
    • https://banghenails.com/upload/file/goxovexijepekeg.pdf
    • http://wildpflanzen-planung.de/file/43815616993.pdf
    • http://kirsanov-maslo.ru/uploads/tuxixenorevojawowudasor.pdf
    • https://camelcarpet.org/d/files/17726103817.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/63767392243.pdf
    • http://gernano.eu/gfx/userfiles/files/63643802627.pdf
    • https://megatekspb.ru/sites/default/files/uploads/56248886735.pdf
    • https://www.milestonesmn.org/ckfinder/userfiles/files/gixazogi.pdf
    • https://fceresources.com/ckfinder/userfiles/files/vipudedoroxabale.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608930c67ac1a---92517892543.pdf
    • https://msiutilities.net/documents/89743624562.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/53852253486.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cad71d79f3376a8e2a59af3d29e2aaa2/nivemido.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/babozedakivelalivej.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/457d7998e9455f47716ea8c543dd4269/lutisojulogorexuvoronurab.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b07bab3d27f---25900623091.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=avocado+and+babies
    • 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_off0000bee4.bin
b4c3e8332354752c6ac630e6088c71a605c483804b22090f6b6ad4d06559be6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE4 16096 bytes
font_01_sfnt_off0000e7d8.bin
2b62d5622d6bb426205ffd5133ac9d262cf7a101f5487deba0f4fcaeb2f17782
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 10304 bytes
font_02_sfnt_off0000ff3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 16792 bytes