Malicious PDF — malware analysis report

Static analysis result for SHA-256 4413e16f1593e481…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 07:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d492c01538ceb445cea256b3507e54be SHA-1: c3d4aa2c65a8e0608185cf5ba230234ffd62631c SHA-256: 4413e16f1593e481125d0fa2235d0eee730fc09edbb0a4caccb0b4a04923c42d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e1dd421564---nasugezetipi.pdf In PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f7ee0d121e9425e18203233c114c56a2/97818675262.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/vibozutonekidexoxuwotowi.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/55158298840.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/94708077324.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/95968503423.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/fezalaguruketo.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/19454247015.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ulot5rvtvq1gmvcllm7mbrp5gf/poridakuruwugomarudexul.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210802_27F2EAEBE529DB5F.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d729804d7---pevudixafenebaxoz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d46c50c50bb---fisulezade.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/zojoviranekitasedir.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611402e4496b2---tokipir.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/mitatan.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/2026004644.pdfIn PDF document text
    • https://eklyps.net/images/file/95413435763.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074047edec86---fejaz.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/votegefixakuwuzigokenarot.pdfIn PDF document text
    • http://nature-revive.org/files/file/kozarafodojusisojujew.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/8169808898.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/zejalalimenox.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/98db6bb4942ac1eda550eae943d5208e/gawekiran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=reinforcement+schedules+worksheet+answersPDF 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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 18136 bytes
SHA-256: aa7350df0a638de20242a99e9d5e25851ea8794228a9cf83d5067d0bae5edc75
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 11064 bytes
SHA-256: 6df9342988e471beefb6f7b86f072e65c04d2cc33ceba9c8d984fbb27c6edd95

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