Malicious PDF — malware analysis report

Static analysis result for SHA-256 02e3878772d7d5f5…

MALICIOUS

PDF

73.4 KB Created: 2021-08-13 03:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 54f9b901023dfd352b7e50d36078d8cd SHA-1: 3b2879fb6eef2ab08d07e5f51a60224ccffc57a5 SHA-256: 02e3878772d7d5f5cd01db87bf266a0d8df5b1d59f9ad308ab4df2db84b91a24
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, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or exploits, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ef6d3b72fbfd49a03d1b13922e789f53/13721880305.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bc1ca5a63e52ea56682b734cc8131935/16342218128.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/28fcf5248e2b4b45e8178c94e7f47250/nirutugovoditugawided.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/bugabofowotinuf.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/53759965905.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7e1a65a9---zowesi.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/28073544930.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/62396648321.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/81347125096.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00365ef194---41842250027.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/mixojiwebedomi.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/84888685636.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/l52b0qcp7ip9aout7mh18vtdqb/jobozibuwaronobuxagevuki.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609224c5cf350---rafimavovibiseku.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/zaledaxuwanunilagene.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/purigogem.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ba3e969980dbac3ba93b7a68cabf8d44/20485527649.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cdfad7e991b184889ccba3beaa3d4cc2/65381316962.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/6364706e25cf03a5694938ffeb26fc3b/nivoxumadug.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160822032226cb---16297708031.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/vuzadekulufuvisazoz.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210625210222_emVkb3Nl.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/gunezonamasuxepebuvepa.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6751260aa3---77324386415.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/43cd5d9866c4ec2077f49f9eb76db7d9/nafepetaxebukaleges.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7e455efda79fff43d5e3221bc873a566/dadudetediralupimusade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=descriptive+adjective+worksheet+grade+4PDF 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_off0000bdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC2 15708 bytes
SHA-256: fb2511d9db2605b3656218ef4ac1faf77f162b94766d54ed6a75bc9d5015a372
font_01_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 11096 bytes
SHA-256: f2860474cd245bf92da7f16d37af8a335c9293c1628c06a14c7385f21b4eae56