Malicious PDF — malware analysis report

Static analysis result for SHA-256 50df092495242286…

MALICIOUS

PDF

91.5 KB Created: 2021-09-04 07:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c562519121fd62f82ab43c0a934c04c8 SHA-1: 00d0cdca53ec62fae2a3e499bec449b94b14a7d0 SHA-256: 50df09249524228645ab1cbfbb349114954fa7643ddf3c7f46f1d0fedce0ebc0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites that appear to be compromised, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9ec19e1a9ca1e64788b1fbc661ebea87/47132977412.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160936a0bec52f---67544661550.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/10743079973.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/785jedmrpeosbin4bnilua4nb7/fitariruregakusototitir.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bf9116d5d---nojerupu.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/jutowumexarebi.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/bedaretosufopidu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075345b43494---sofebifavudoninopixuvu.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/o9vfjvidavhd8k2uuq8d5hael0/34133967117.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/41136868915.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/pixijimesimivifika.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2b4a8842515bc54b3a16fc58a7b74b6f/64168897575.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ke26j0h04740s67q3hhnclkn7q/luwulig.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/6829626550.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/58046230289.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/56514224742.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/20486841062.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/21516553636.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/95004725317.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/fiwezomaboxisoweder.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/nulanojan.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6a21541a93a1e37dbcc09afb7c9af6f7/54813964134.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be776478f54---86675088500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=critical+thinking+in+psychology+separating+sense+from+nonsense+pdfPDF 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_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 20188 bytes
SHA-256: 806ee8a90cd9091e49b47aeea53e41c8d750d3655c46f621b138790e9fc8f3ce
font_01_sfnt_off00012d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B4 11304 bytes
SHA-256: 6ef2a9ae0604ec6ea78e3873280eea555db17c78feda258761d4d13e1edb9ac6

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