Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e950f1042f3263…

MALICIOUS

PDF

89.7 KB Created: 2021-09-07 19:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fee292b161a0df6058029f05685e2961 SHA-1: 0916f1988fcec533eea876a911687439ca3af09c SHA-256: 61e950f1042f326329a3f84b99d8998f7fcb6d0ed4e18cb6633d9f3502595043
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://munnarinfo.in/userfiles/file/77202602697.pdf In PDF document text
    • http://gaziogluenerji.com/images_upload/files/xikubiluma.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5e2cc53e0c69d343957f436793363411/wexedowafupaninuro.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sirebonilawomedu.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/32625900249.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0ab7f4c6---22752699899.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/nibinejodewuwakodawa.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160929c7413000---68890542945.pdfPDF link annotation
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8muhdvhmgjclgthv7mk8a189oq/renotewadewiluruma.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/23263703299.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/jozibeto.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/diratapejuvoku.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/56813540684.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/nuwosajunegugukoke.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/32073690776.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/pogajewewufiripok.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/88232054201.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/60405588346.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/rupuzesagisozatumagoj.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/99593863825.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fb80ec114---gegawerusaxugonuseb.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/mukis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=longman+english+grammar+for+beginners+pdfPDF 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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 20528 bytes
SHA-256: cf014f0f18f6f8966c7237f5c5effc6072b25a8001b70cbfc0283fd90c38a503
font_01_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 10944 bytes
SHA-256: 751e23a488c627173a1f691194e027f3ac653f7c6ae918eb122fc397516a644d
font_02_sfnt_off000140c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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