Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e996afa3cab9fb…

MALICIOUS

PDF

95.3 KB Created: 2021-07-24 14:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bfaab11b5791c1f7cee469fd7f711a30 SHA-1: cd062ed5e4dcd4d54011b0ff36b60f320bc1df1b SHA-256: b6e996afa3cab9fb8520c62ffc8f6082e237d1831076134f2284492752b24669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/605f6f46f8066cc5b56fe1377123e123/juritikewiboxonuxofuxunot.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608358511c54b---21104763707.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/rorogusimupode.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/pabojav.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c6b963bff---87506254534.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/38c72668eeedad12e37bb1301ff33578/18931379625.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160889070a6c33---jumojevekuwinoj.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/15203030388.pdfIn PDF document text
    • http://st03.it/userfiles/files/navuledipuvarubaxijewug.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/zulimizolewebikusaloxoxe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9901b262c.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bab573868ed---gekawoxesajepipobafomufo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e783f3ea---3427570927.pdfIn PDF document text
    • http://homeopathyhk.com/files/74681380110.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/femosasuzazajokobolotejav.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3slqdv107q7lbucflgtpjj7i4b/tawupel.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cba3587bf---79652670426.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210630_222555.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/139f37ab2a06b6bae8aaba937d5ea828/newimotusewamenobukeda.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/pexefetu.pdfIn PDF document text
    • http://erictex.com/ufiles/files/kevilolusa.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/dajukuvurubodiwuxu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2c2d21224734971375b8db710d260d27/30667750165.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/faribode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+much+do+indoor+football+players+get+paidPDF 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_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 11496 bytes
SHA-256: 8ad4d4c30eeb49db429bd9409e25eb5e442f3fa143d0ec2ec240c0747681e70e
font_01_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 20452 bytes
SHA-256: 87965a9240cb2cb81e4dd5f4abede56215f43f03ba2e300791ad858545d35600