Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9275449c3c28e2b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 08:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19800a9cc959c941943730f69b2735c4 SHA-1: e2e2e6e6b916652452ec473a3c7f7933fc00f2ff SHA-256: b9275449c3c28e2b6cfed95971e08dac9d64df20f28a068fb2bbf167b1d20ce2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms. This suggests a phishing or redirection attack, where users are lured to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://broadviewlibrary.org/uploaded_bvlib/file/79391825195.pdf In PDF document text
    • http://language-coach.pl/uploads/files/zagamadegakexegog.pdfIn PDF document text
    • https://noddy.nu/images/file/voten.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c49ec671347---fafunesoxu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ca9357b80edaa763dade9dfe5649ac70/sikasom.pdfIn PDF document text
    • http://hasyo.net/files/file/21448454715.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/pasorakamuvuvelebipub.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f49987577---21555684055.pdfIn PDF document text
    • https://kawanmto.com/contents/files/49923844882.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b504e63d1671e3928c648fb4ea37644e/85355511845.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/3319168762.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c6e10ac2---64327556923.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/0b9bc840aeebecd1374d7b4d1c2bb515/gewudal.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728abe37c57---debobijilivivubawusatexup.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6so0riq3btpnovpetoo0h09uh2/tobevoganepikebolasex.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075774fa5a40---45621866884.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zanulodavezewo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16116b2c42d000---lupexil.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/mojidojobu.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/guxokezifam.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/sovuborurolubujalulabudev.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c677d466a---25307615905.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/7b6f91446fe0f8ffb7cb3ca41756673a/87399131868.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/wavukajagojifixikabebora.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/72420760199.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210610033048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=algebra+1+review+worksheets+answer+keyPDF 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_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 17708 bytes
SHA-256: b74862e22629d5418a3893dec8dbc5b72f5d44004d75898bc99c71dc39ba1936
font_01_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 10920 bytes
SHA-256: f6242ea1c3d47ff94164dd3b0e75954862ab395fd2d924ca025f685ed3242a79
font_02_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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