Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada66bd03f4a0205…

MALICIOUS

PDF

104.2 KB Created: 2021-06-30 04:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f4a1507c63945ddbb696e97ed9fb7f61 SHA-1: 3c583c1d3e52a03386e7e636c65c003eca8dd1c3 SHA-256: ada66bd03f4a020570d51054cefb5c6a36477c5cc159462adc4a9bd14e1e4348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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 https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/88c476618e6adeeb83d9cd712402f144/kavidukigo.pdf In PDF document text
    • https://medtek.vn/storage/file/valabo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d473f71330---zukadalezedak.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d8fb19ae50f---zibejowesoxomi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a36e256a---1338840002.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3c814d75---jejotozarosakapev.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/048fe3bbb69c2ecba2ab3ac07476a555/sunitipitev.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607011d8d987f---97939770804.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/cb57370e8ce6185f04c0e8715abc0dca/xasubaronip.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4356cdd7---21487221179.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/37339037407.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d2331e2f8---71054850134.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf00f6246fb---jiganumet.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/63829179423.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3f7c2ae87dc11171b392e3c14510db45/63681612179.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/torirasavixesikokov.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b22bcf872fa---gulem.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/fumipuvu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/84jmocc2fqn1a7omak0grpt9ul/88608127561.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e46290334---4530554328.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/2lr378kk4dlethtqairf2hoat0/dokag.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/menp56bot39rtsre2g4qo8rl5o/30062062571.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/62976169944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+meaning+of+tabularPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014230.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14230 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 24728 bytes
SHA-256: b40cef6d9a8354ed9e9a13de5996d91b6e4133163b001c2834929e6a1f91ecd9
font_01_sfnt_off000134b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off00015fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD2 10896 bytes
SHA-256: 05c9bc1901b2de1ac68ebe603f032c1f0a6e1da74c46ec69e6030af61ebb2752
font_04_sfnt_off000178dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.