Malicious PDF — malware analysis report

Static analysis result for SHA-256 1485ea467c83ab63…

MALICIOUS

PDF

89.0 KB Created: 2021-09-01 10:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b815c265e64a67b383cd4b25e5957823 SHA-1: 744d1ce33104b6b27145fffc31df617e01a2f249 SHA-256: 1485ea467c83ab6376128b3a913f94cb676dba123b46a727531aa01b55bcc4d8
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://teenmag.cz/userfiles/file/volonowupogixigadupanew.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/t32553th4qmngk54ikhn6lc1p6/93658446555.pdfIn PDF document text
    • https://medtek.vn/storage/file/bugidaxubopasur.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/18186710325.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/27547476921.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16270990695483.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/getubalagalejetup.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wemifopadupukexet.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/butusowo.pdfIn PDF document text
    • http://rilta.net/userfiles/files/6985320391.pdfIn PDF document text
    • http://e-sheremet.com/img/kukij.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6c8aaa1e3ece15611ca68c45939e4cff/gajovalawukese.pdfIn PDF document text
    • http://ahknchem.com/upload/files/29181184084.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5cau4ampf5hl29l1jaaullp13v/nomimazovoxemeruneloda.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/98281484163.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/k4a0jojuqbjb2aogtv1r7osip6/16286183577.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01ed1ce09---fedevu.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/88739178519.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160963c264df64---sumerer.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/11906038986.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/cdc847ccf13cebfcdf8fc0dbb94192fc/nukajifob.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pr1qpg404aefl5q7gnomhidug6/35456008534.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/41465615271.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/64787995536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hogwarts+mystery+answers+to+questionsPDF 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_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 10840 bytes
SHA-256: a46a2bb9169e2143ec3b622cb1d6293c3a7b8352632fe5bc014ebc96ae28bfdc
font_01_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E9 18788 bytes
SHA-256: 0bf3d7fed3143553cd8b90b35322d240fc877aefb5c531847359ce1182889cd8