Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f70bab71241b573…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 08:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 147b53feff85de8c7ef3b8f6b8d1d089 SHA-1: 5e86dbd9e5650f7ab02236eac29cf674be0a4110 SHA-256: 2f70bab71241b5736ef37b2a3c039c3e0dd7a684c811c0ef0971ba3e111e0682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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=b612+face+swap PDF link annotation
    • https://buonoantonio.it/userfiles/file/97597778688.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/98379296637.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/78187733488.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f6865aca1---juxogibukose.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee20eaf11b---gawubamaxenuzulo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f2974617---nusobugedemibasamanojamix.pdfIn PDF document text
    • http://alkanboya.com/files/file///60586084772.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/13709789123.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/levuzoxirufejotazetabu.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/jenobekurapajosilufope.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/85512096689.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613453066c820---fumojegepo.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/wulubit.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/sakilimudulos.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/wupun.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/ruzofinemosukaxus.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613115fbc22e5---29448781254.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/xidawasujobuti.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84022239340.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/38763509019.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/74420798898.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/rebavosamubupidadin.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/66568384469.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_off0000d074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 10392 bytes
SHA-256: 5190dbf832e7af0761f67372a1d05fea3f75812178147a452c50cab6093faf67
font_02_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 18208 bytes
SHA-256: 6d18658b2f285dddfd26c10e9126b549231e3bf090a59211cdcb1501e274d715

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