Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f7f6df2f3aefb1…

MALICIOUS

PDF

95.2 KB Created: 2021-07-04 20:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 19751f3d6ea245d56c7f4f9e6cca76a9 SHA-1: ab7cfc0e4e7ac9f12738576321597c34a3d7460d SHA-256: f4f7f6df2f3aefb1aae3685b35812d5c53bea165bcb08caaa35a7c2d4c79b7f3
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 pointing to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users to phishing sites. The PDF structure and embedded links are indicative of a phishing lure or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ac8c3071---tujasodedijimajavu.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gr8ua91dc8c5mho6l31s13nku5/figesoresefipaliwitagol.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856fce5ddaa---napoladilovepukatawotale.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/cd876618b3d4476df2acae999921e071/9977741708.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/57c1468288a744b2886de9e49c7d0689/nebaten.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/leneleg.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb5b2760e---gerivunipabetagobiteseti.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3708342d39dbad84a1d742e6edce2fe2/molulukupejoj.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/qr6hqu569ecpnuk0sbggndln94/rologomotonexijorajipa.pdfIn PDF document text
    • https://limsurdua.com/contents//files/toluliviwizofiwatote.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/tajujem.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/dd4b27f2a55731c9dd602727131d25c9/wunimuvebotuguloxesarerum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19edd050cf---dusoxa.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc042686ff---27507911059.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/33457838581.pdfIn PDF document text
    • https://advik.net/userfiles/file/48462988423.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85febad7ae---fesizewegab.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/zepoguwixisewupuso.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/88548478611.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2acc371d85---zepiwumifuzutilefisisepat.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/sodazenimuxuxav.pdfIn PDF document text
    • https://limmaginebistrot.com/file/86518515055.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93ea4e788---61003070478.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/vuvarofemopolovevudilita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tool+wear+and+tool+life+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/32242768397.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_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 10372 bytes
SHA-256: 909d93bbdf34d33414e4789caf7bde1988dca70336a272648c478ef51aa648a5
font_01_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 17792 bytes
SHA-256: ba91c45211f80acc7ee2b0acc93a42aac8c578e2d5722c9ded73739bc6c3daa7
font_02_sfnt_off0001575f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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