Malicious PDF — malware analysis report

Static analysis result for SHA-256 656bc2e1e0047ca1…

MALICIOUS

PDF

100.0 KB Created: 2021-08-01 01:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2dc33aae54f16397565b859f36cf3087 SHA-1: c4175991bbb1808a032ab34f74e1744317db8bc2 SHA-256: 656bc2e1e0047ca1ea6f62d68e1fccf13c007fb8344b45b20a57c5b2dd3fb114
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics indicate the PDF functions as a link farm, directing users to potentially compromised or disposable hosting sites. The embedded URLs, particularly those hosted on compromised CMS uploads and disposable domains, suggest an attempt to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ackerviewguesthouse.com/userfiles/file/toxaxafizejomexage.pdf In PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/mevijijijeveboleja.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/27861848705.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/8456954660.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/18083145122.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d979617ec300e1b35387a7837376580b/1771783943.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/70893492828.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/tonefolasasepu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2398dac05---98516161350.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/pofabagaruve.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a1e58a1ad---betodigomatijemelilaj.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/nufoxaviwetulidosu.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/19053276638.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d6edaed2888ddbed4d5ac871f9f53a04/korebuniditupevekujawox.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/30986151835.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/wezubaduzir.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/sukowagulovuropazegizefug.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210530185217.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/43364890369.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/db8a09a4b31cc396e99465d832947984/88752355433.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/da6fbf9516b5a8ac7a367c4f4ede48e2/wimapetixozavizumapakufax.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/emah6b067qk8e3eftmrimlkatr/60604133410.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d627312d844---ragadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=physics+worksheet+lesson+5+two+dimensional+motion+and+vectors+answer+keyPDF 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_off000118ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 20848 bytes
SHA-256: e2f95190410b5d9af91d44dc8310c82916e41f8b949dca28c262aa92d7193b1f
font_01_sfnt_off00014ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA8 11128 bytes
SHA-256: 1274475b1d123f1153a489578d6d40faba5bd44056a0eec3fa3d2485b4748af5
font_02_sfnt_off00016899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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