Malicious PDF — malware analysis report

Static analysis result for SHA-256 980f9a7c93cca7ea…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 02:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90c4065484d600cae42b4157f578d789 SHA-1: 821ee65d104b8472afd052298eb82053eddcc91c SHA-256: 980f9a7c93cca7ea92f8b4f8a8f7ed2e5ff32b847ee4213937367e2a76d730a8
164 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to compromised CMS upload directories. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading further malware. ClamAV detection confirms this assessment, identifying the file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=sistema+pleur+evac+pdf PDF link annotation
    • http://leasingtowers.com/ckfinder/userfiles/files/47203354714.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb0f6b13b8---zunoxijezezezi.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/49246982369.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pki0sp2kt27iohabk271qt0rn8/83301087075.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/luxugabesinawusa.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/95898046409.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b88e47713---7962846090.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/vakab.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/52813411629.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f6bee45b30ecbae2e479c111c963cacd/77905992382.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/53281193545.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/bn24fugovpotecrar20pgvcnh1/ledesimezesilipaviwopof.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f2b308d5c406d06781c44d8eb8641897/mufiruwuzidawi.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/xomozepizifibogexesut.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/perepak.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/wadusu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba9b9fdeb1c81945a8551f2e591bc15e/19491291092.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161163f17c7b18---26233140392.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109c6ecc028e---gunuwizofelatavovamagen.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d817b829d---mebomuredaguxegalezolo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/xuzosejorov.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805287817aa---retajapezop.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_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 18828 bytes
SHA-256: 568d0a5cae9783be1ab5384a55cd83266e886047ff40e16a42c62efda03f9518
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 10796 bytes
SHA-256: 9699aa78234b339e7103c3f93acfc659e5edf895195741242938926ff33366c3

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