Malicious PDF — malware analysis report

Static analysis result for SHA-256 18808f52e725064f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-08 20:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b835a737e62179c4ecfa288619a2bb0 SHA-1: 94bb53b9e6beaafce2056cafc1f25c580ec9e55f SHA-256: 18808f52e725064fef3fae2f4fd57de097bc211b21b5df03966b37aa37d26b5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, indicating an attempt to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to obfuscate the download process or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://technoauto.jp/js/upload/files/bepomajapudav.pdf In PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6342081b3f619616cc88a84a4e740ae2/95412414665.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/74802239697.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/57721714124.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/3854571938.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/80698062566.pdfIn PDF document text
    • http://net-marketing.hu/images/files/38270697861.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/44743354317.pdfIn PDF document text
    • http://gsacademy.ge/uploads/files/90641236111.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/tozupezogigerugikig.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/natamafivuxulafe.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/pozikofawupesusog.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/25361006612.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/7134768033.pdfIn PDF document text
    • https://suksesunited.com/contents/files/lunalaji.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/20956361878.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/nimetixuperizez.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/82428086724.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/30403975352.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/lebozobomat.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1b06d099409415f467744353bd9f24ba/10809320618.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/mufumo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8857e64cd229efae6c273e8377f88378/fodowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=martin+seligman+books+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_off0000b756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 16252 bytes
SHA-256: 93eb20f74b2b471bc66cbb23d710a2a66e7ee1d4b3c1fe45f1e2337d46d4bf43
font_02_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 11064 bytes
SHA-256: c96727dce195bad56860bb6fc305e45deccdd802a499d53250cd4942fb6ac36a