Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec86226bb5172b69…

MALICIOUS

PDF

91.4 KB Created: 2021-08-01 22:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2e088aa558d3ce01b347fe3f3bfc7479 SHA-1: f6c055a9468cdf79c9ee8c600a40b08c51549a1c SHA-256: ec86226bb5172b69477c8f078e13232dd878c18c16fdefa8a085b935f9868f8a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://allytemp.ru/uplcv?utm_term=the+solubility+of+caf2+in+water+at+is+measured+to+be+.+use+this+information+to+calculate+for PDF link annotation
    • http://np-laser.com/upload_fck/file/2021-7-27/20210727231022639652.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/wigewobe.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/fckdtsbukcbakjm3a3jpvn8lo4/19079742492.pdfIn PDF document text
    • http://remobudostol.pl/pliki/mapafipel.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/702df6fa5b24da5fb4b4a964a77fa45f/nubijatotatufederesi.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/65422133553.pdfIn PDF document text
    • http://iworking.vn/uploads/files/7460187827.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083b32d1233e---barotajezerilo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06bd5c773---jixoweweperu.pdfIn PDF document text
    • https://camelcarpet.org/d/files/wenunasomagazavosa.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/vufowaxut.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/nexapofag.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b34739ed---97545163944.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/juberejumifemoget.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ae9f2d750---letulexekavasujupavulara.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jukoruperogujovagijuzomi.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/53123923567.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/vumusanuk.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/66995992563.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/550762796.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608494f6b1137---49086410134.pdfIn PDF document text
    • http://novichiha.ru/pic/file/25298278177.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f50c8b5ecb29ff1006f461c88a56a326/zewodagakexowagezifenafi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608705d3bf153---64461252764.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/kojobijipumosamepi.pdfIn PDF document text
    • https://kede.org/userfiles/file/1396946004.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/suwidenerudumo.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_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 17740 bytes
SHA-256: 9ac5d8ed86d1d63cdcfc1f3a567de494e39065c609681c9704d69829d9903630
font_01_sfnt_off000128b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CC 11328 bytes
SHA-256: a69d07f34d23052dc478864a87b4ac4203ac49ecf1a3e98a0709856fd37bb969

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