Malicious PDF — malware analysis report

Static analysis result for SHA-256 351b71b65ea42e9e…

MALICIOUS

PDF

93.8 KB Created: 2021-08-25 23:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3f2b798b3ff40740771633bf80d6efc SHA-1: 3c988642c351bda157cd04d56dfd62f836d76bbe SHA-256: 351b71b65ea42e9e61c0061015e17882fd6be31ece8a5805c75ff50b1f583bfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or downloads. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cambodiaangkorhomestay.com/userfiles/file/27405428136.pdf In PDF document text
    • http://likuidart.com/files/ckeditor/files/degatipujozalotobuga.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/37612795257.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160831156df188---61178070787.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160aec8afb0ccd---tixovimebi.pdfIn PDF document text
    • https://ivanamihic.com//files/48017347404.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608455d93880a---lokigobobi.pdfIn PDF document text
    • http://jadeite.ru/images/file/dikizuvosuvinafopokaj.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/76661994801.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/178510859678930b180f0349b5924171/lutixopekipapudadexasiket.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1002b8799834c8718dfd9dd155d10651/zoropukafodinigijerikeko.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/1e11243396f5afe356f663682f063a87/44961716047.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/wofum.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/xawamitogejejo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee34a78d3fa---2353582137.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/goveditopoxebari.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/68848008686.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e6bfb00c10944ffefe34a254ccaa83ae/28765576402.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a317829824---86122477023.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/k36dcfbbercj9js5hgfnf0s2hd/tezexidetutavosevimipem.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4517f2d9e0---40763957318.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/feworavugarowawamupagakog.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc5b101619---naxalu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0dd802c904df0eb866dc5d8796cfdedf/kulen.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4906dff9cbd3c09acb360674ed3a4bec/10353381071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=everytime+you+go+songPDF 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_off00010d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 10504 bytes
SHA-256: fcc42c184c40abc217e5c8479d105704478929d92fe9fbaa10e7f014818e4a3d
font_02_sfnt_off00013d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D21 17032 bytes
SHA-256: bb6cb7d3fb34f7a6b13aff59794bf10e7e35078b284f3623cc8853386a4183da