Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa35d4b275d2a22…

MALICIOUS

PDF

96.0 KB Created: 2021-07-24 21:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5589dbfda3a83081235b6ab11104eafd SHA-1: b670867b9264d7543f54bae8dbb4629b9d54b665 SHA-256: 7aa35d4b275d2a22dcb7a5bd2c9c0175b88cb24fd9b1fa6b33229e1fd5c11646
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/63235006075.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/kp5ap7e3a9h44emeejk6637p52/ruvazebome.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8cf94c5cf7a1f607937ea8208bbaa4f4/danimebimapufineviw.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e0b143ed---wofinejorufubi.pdfIn PDF document text
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/manozevezutamawamot.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/0a978b3c54ef8bd4e86bc1cd7dc9e71b/jubowaralujenazimepo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d59ae6207---56546225672.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/u86ur1btfbkalkmuqaaitt2jr0/dumidaj.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/dofozerupasim.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/55493198168.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e2bcf7a2d582e9ddf0cc99ef48c7ab21/512371893.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/fb6l75jv7dnplbm3vfmrhvpvn1/mekosefotawutefelumexoxi.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/7552063470.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/30786637767.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35521ceb4---zisufebepivu.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/gopiwitegas.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dec9266c853---nezaboxe.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/79366326134.pdfIn PDF document text
    • http://rjt1.org/upload/files/tezozovulepub.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c99f120ca9e---34384798326.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0a01067e---96143537586.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210724_B2CC4A844731885C.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/94168759175.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3bdf9fc13a632bd87da2199489a1b62b/vizipufepiboresenoka.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kogubexokukunezok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=distinguish+between+equal+sets+and+equivalent+setsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 10848 bytes
SHA-256: 5a725dfda51f2ac21c2154472c58c4a632b1c8969f27f4cfce62ec0842092c2d
font_02_sfnt_off00012952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12952 18664 bytes
SHA-256: 98af537b719619804f1dbe3670b8d23227cc19dd0e11578724e2b2ffbc60af7e
font_03_sfnt_off00015b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5D 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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