Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd6efc789c5f17b…

MALICIOUS

PDF

95.6 KB Created: 2021-08-21 03:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 90a25bcb77c9eb8f9611cb9489cc9abd SHA-1: 8a3f06a5ddf3e8521d055c51bb01ad70f5776164 SHA-256: 5fd6efc789c5f17be27478b5f677b0022be855d5f2773bd06fb2ad6cff590ff6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the PDF structure itself is designed to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a98e9df87---67910104006.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0d025d272c6dab5a957c1d4fc6921239/kobirowakux.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9b2ab74ea07f432bc23d6f89eec8fdaf/11712344807.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/802893403907c97dd25081db44199a40/35649492828.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65ffba23b3---pawonurixojujasazezij.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/tekal.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/88392153208.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/gakorufutufasutojogo.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/a5ca1d2f37c8421de39b80923f4008c7/7829554847.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b63d2d368---71069043261.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c68a65f0---sefanimagumotesuri.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceb8a45aa0---65821838252.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/02l9gq3aehfg35mub6cm851qv4/taromufavewixolo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d481b98037---40943039102.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1e7446116755dcf5abf6021fa12b0158/wameremazenulibur.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xeroviwakexap.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/82935449224.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c0f6aeae---zajulasodoxotisegem.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/4530350556.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/fudotujenepipalosu.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///mebaxebuvanirugiwuxinimog.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f47a9f5a---93881500622.pdfIn PDF document text
    • http://haphadoor.com/upload/files/tovatemowige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=otis+spunkmeyer+cookies+bake+timePDF 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_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 10960 bytes
SHA-256: ac6e7c862fff7fbe834acb41bf5cd04aebfc35dc6305e8e3f74758fd190ff6fc
font_02_sfnt_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 27696 bytes
SHA-256: 2dacec24cb9803b857546d92042852cd6aedd7e5de8af4fb72fc88fc4eee0960

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