Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c53d9cd967b12a8…

MALICIOUS

PDF

145.5 KB Created: 2021-07-07 00:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10c9b88622691f7dc6f14ae435176aaa SHA-1: ce9ed411ec0069c6253b92643986a3f5ff8359a5 SHA-256: 4c53d9cd967b12a8400375a876b477c173c8aa28462cae012db43c0b8a394f93
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.alapan.org/fckimages/file/927663348.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93fc2b48e7---63803610366.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/387a673443592f457a736c5dee2808ca/vaxisivapokip.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jv67m8brqf7eubva0hfcgj6ma2/52731257198.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e07f5bdc29e487a5def59dc575601165/xatorakodo.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/49462506877.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/m4jncu9a7kapsktr5e3bvmp7fr/50740806456.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8ab81eadafc1f474b23fe379c6ac8bd1/gakexugakolegojadexudiku.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/73030f2cdf7d0719bcdf113dd97a9b54/27125375686.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3f1f30ba9c2a55a4c20e2514623c9e77/59195586834.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/867d0dd70b1339bcd4b23a102b272e50/36535808902.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6437d2660e---mawefisulesitirigowoxurud.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1622634808.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e07fd8771---mojojawejiragi.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/47667893226.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/kosuxagexutegixiwo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01fbabfdc---kanatosunerozidipoxifawod.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077188fe114c---nekasasefifujuraraliledub.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/noxikekovafepidofemirajuv.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/92efb380f74039948f15e1968c7aaebf/83907899214.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/71004812086.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/bt5uvc2bvi5c851h5ffbft5329/gijapisepeveduw.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/5253642702.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a0bd88739---92167166281.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/64342059819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=norwood+board+of+educationPDF 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_off0001d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D598 10560 bytes
SHA-256: b70f327802c2d957924a6ea4c9a451480da7b2cadad23e77b8660c780f01cc30
font_01_sfnt_off0001edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDD6 18336 bytes
SHA-256: afd1457dbb03719f444210e46c85a862390695825c3d595c71c17ec7795e9643
font_02_sfnt_off00021ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1