Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a30cb3cba449c7…

MALICIOUS

PDF

84.6 KB Created: 2021-08-21 07:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 757907923d17ed13f8cec8f1210043b6 SHA-1: b80cc99fcda96f855457645421021fcf4b3c8255 SHA-256: b9a30cb3cba449c7740ee1fd40a6283541a1d1bf787021a088a5a4dbd6d77716
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage, suggesting a link farm designed to redirect users to potentially malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3f0b78e9---90957776591.pdf In PDF document text
    • http://asckhn.com/acskhn/userfiles/file/kaxisitexofi.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/gixaguxakodaduwewuwo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1c5a2f9d---40926453771.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/93191898199.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/52985424243.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/g6k8a2a24kgeoab5f2lfuh7v87/rosisomemosoj.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/jitetebivemobarigo.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/58179763610.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a494e85aeb7---lovaxagegofoki.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad47d6e852e---37812924328.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/velufobewopo.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d5ib2cru0p76mvb9btprh58qf9/janodukokoxe.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/figunikew.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/rupeforudotovape.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/48657785354.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d38d47f5b---latefamevetipevoxejag.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/punojusixetafutu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc3emt74c5v3a91dt1rumfl880/jasowasun.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4dfd4eac49b5502fe54c7d80b122f544/14734396207.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610e525e74de1---xanodifepuda.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/23986195362.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9981b5a4c4---kowufexogibojel.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/konibuwinufolokanizezatiw.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/befbb320d3778e8e049544ca3c0d06d1/9880440288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sample+resume+for+housekeeping+job+in+hotelPDF 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_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 16840 bytes
SHA-256: a12780c344af22aeceac0edc4e09d36153d67a0d536d61ed006c58d625123fe9
font_01_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 11340 bytes
SHA-256: 891e800023b15d172571e3bf58f22cd365f697f29b469e9cf882577456b1eb70
font_02_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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