Malicious PDF — malware analysis report

Static analysis result for SHA-256 6686f76175da026b…

MALICIOUS

PDF

82.1 KB Created: 2021-08-04 01:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9687506a50579b40bbe6832d42e43c52 SHA-1: 8b18443fd7bed30399349aeba565995df48f8f32 SHA-256: 6686f76175da026bbf06e7b85e22ef65a1838ea3d08fa3ce660b3a6885ef1df7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple links to disposable hosting and compromised CMS upload storage further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=how+to+open+exo+terra+tank PDF link annotation
    • http://danieldesignpro.com/userfiles/54934865764.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700c10c114d---sojom.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a227fe69bce---14120029646.pdfIn PDF document text
    • https://synersys.fr/contenu/file/voliliwagidelerosobod.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/59394443044.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/12948842297.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5575d0d51---3528650697.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/gebodebugipivubutibi.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/40040378046.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/bezubikemowo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/4287d7eb276c0aaba10405931d3dc54b/73326610713.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61ded2df74---vapajawuwi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/09b25ea7886a3c014fb69a732b040a2a/58769759653.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/vuguxuriviguwi.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/wiwizejimegigano.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/tobunawalimug.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/6287347249.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/36708f967f0e8ee6fdba8fb121916230/samadezifunazuzuruzimoko.pdfIn PDF document text
    • http://camwater.org/media/files/95516092314.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/88ed82539cc0f55d30feab291040feb8/26069526073.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/furivifokexewerabalarig.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f4d391e6c56ee476d4db7a5d968cb598/zedovaduzoviremerup.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6b570b7a211ee9e5a74504223fbfd28f/bebolurevijemeduz.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3e3ab95385348b93286b5016bf985d9b/xedobunonenatami.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 17224 bytes
SHA-256: be47009de633735efc15f2f396c741c40fe35f04f3b68839453413642c3fb32a
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 10208 bytes
SHA-256: 348daef20ccd02ef2bff6881a4521f401a82c6f230a3502745b9fa3eba8590c1
font_02_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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