Malicious PDF — malware analysis report

Static analysis result for SHA-256 3966157126e3afdb…

MALICIOUS

PDF

74.3 KB Created: 2021-09-01 13:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0bf09adc4bd4d6b742e15cb3b33f521b SHA-1: 20cd2551d4d46170b426c7c428fd8fec1ceb0eac SHA-256: 3966157126e3afdb979e79016f2f5387d9a0bb2fe333d716bb06c393eb47136b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=second+generation+computer+images PDF link annotation
    • http://royalrep.com/userfiles/files/53746936994.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/90060975051.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/rodifufonifobaweb.pdfIn PDF document text
    • http://chipgene.com/image/files/20210729_225125.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cd12966486eb89d1a8ecac5cd7a10c38/tevegazile.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2o26j9551h5kubcvfu6i3mg7ko/88991774350.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3f32e22b682c7a16e45b0b9088df161/15942425875.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b54a02a9---21732339813.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160928d11c2890---1342615396.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099e35110a3b---2314820046.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/xegetunovixarapezusekuva.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/tevid.pdfIn PDF document text
    • https://jagominum.com/contents//files/wonivuzusaxezebuxatuloz.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf19b735615---92951524073.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fekagigikokuxasudexujafi.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/bofuwononave.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/60359724062.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c897ec2305---61343432031.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e23d9928ed0856663bd5d42f9e53219d/dimite.pdfIn PDF document text
    • http://gtshotel.it/images/file/49049285208.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/6791336641.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160734a3ab31c9---pevuf.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_off0000be75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE75 16816 bytes
SHA-256: c0941b8ef6bbe9feb82e04ff540caf4da6c45ca53a05a01fb748ffcae309b339
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 10984 bytes
SHA-256: b3d9403ca998ceb5faf9b9cb4c3d1fd158ebaf57be1fb5c7d1d47afdc73bc4fd
font_02_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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