Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8257efc3681af0c…

MALICIOUS

PDF

91.7 KB Created: 2021-09-04 18:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 730cd1d274dcf4e2ed83e0e8ba15aaad SHA-1: 1a2db8c30f7d0ed64dd0e502e240740774e1792f SHA-256: e8257efc3681af0ca536590ac09a44d4aed85eb230cfa4ef0e908a405ec3f6e4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable hosting. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=simple+trigonometry+formula+pdf PDF link annotation
    • https://europartner2.pl/uploads/62567292027.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/30325348175.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/14430521048.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b661c398db13fa0a1ace7697ef55328c/fajemugunolixabeli.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/meg45ooebnd8rjqfcdmjkdboh2/47909203917.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rmmooj4adg3n1cp6mjpfcoqen6/buxupaxupexalu.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16244137996053.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768da6b39c3---ruzabiwofaduz.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3192e68c1e---siloxinosewafimox.pdfIn PDF document text
    • http://blueyee.com/upload/file/301702091697.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/53b3b88a51d42f764de33e6dc5250e94/10860156353.pdfIn PDF document text
    • https://aashianarealty.com/file/metowe.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9412e4f9---lefejimewizuwewupume.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1658faf3ab---52489330788.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/35949353558.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/24f4h10g7df8opvkppq6tum1i8/60322362890.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7fd13ef040b34136e81201ea29bdde5b/murifemuxijupuvalak.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/fifafufajidegesitefalu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070288d4762a---zababex.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/7144867250.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ad2b124c7---zefuperufogoro.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/72522455333.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/sh2a8doq0anlo83o47opdq1dte/53594262652.pdfIn PDF document text
    • 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
stream_004_off00012aef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12AEF 18512 bytes
SHA-256: 5da9336fbb91f1e7f0f52c8fcb6b85e202fcd62a8bbff0acd9171546a631c7bc
font_00_sfnt_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 17992 bytes
SHA-256: dd0a3321c431d2e0810491e2dabe8d8858f8cdb8ccd0fed25f4ee1b3bb0a87f4
font_01_sfnt_off000111b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 10964 bytes
SHA-256: 86087b782d89820113d688341e0507c6b7830da4c78f45db4f153cf363bf471e
font_03_sfnt_off00014873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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