Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c092467c3e6a9b8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 08:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 640edb169075a9e3257ddd142579f7ba SHA-1: ceaef4ffb4022cc3dbc02ec100a9f87141ce483b SHA-256: 5c092467c3e6a9b875c6bf9855a975dcf58ce7825194ffa9f3672b205f2f3117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a compromised CMS upload link further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huzatfokozo.hu/editor_up/wewepo.pdf In PDF document text
    • https://youxsoft.com/uploads/files/zuzibujobumozadukolotug.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/46097073119.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/timetiwibi.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/puxemowujukurudomem.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5a90fb44---34076946730.pdfIn PDF document text
    • https://ntc-container.com/upload/files/wikalu.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/49211716283.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/vopomivabe.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a5846cee---66624018218.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/44422556749.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/womibozuxavanupigomag.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/toluke.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/37vgi8mven4ec5u8up17urt7e7/dulefonuworimitido.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/disukitupilisulo.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/36e899ed3170ee85e133cb3b74c68287/88128992574.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141189f8dd46---vogekuzad.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/49209652513.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sewit.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161338cf61130d---58015252433.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/59799080066.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/sogebawufetifaduz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+bath+short+story+pdfPDF 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_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 10568 bytes
SHA-256: 7e49a7b544758e4d0aa6b603dbe691361f9d774a4ef981810c656a86df64d50e
font_02_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 17000 bytes
SHA-256: 8a6bdb8a265fd7cc4987a095c58ceeac86a90e4a78bf9b71bdd633bc01c7f24c