Malicious PDF — malware analysis report

Static analysis result for SHA-256 c527423495f038c5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 15:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d93de8a0fd98313015cfeddb7c98b771 SHA-1: ab2fa0a8ea168001ede4ac3eefeea62032a09d26 SHA-256: c527423495f038c55af5b126df9550ebdf100bfd02f56b9872d32a925c865bf8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nomylo.ru/uplcv?utm_term=te+daria+el+mundo+pdf PDF link annotation
    • http://webinaris.blog/ckfinder/userfiles/publics/files/vumejoza.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010551f7da---sasosorefobirodirazudasu.pdfIn PDF document text
    • https://lapakunited.com/contents/files/pokofosuxovoguda.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sonepogomusunumarivif.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/fojadarizizula.pdfIn PDF document text
    • http://geotersrl.it/file/telugigu.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/78481172524.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/57474023441.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/gagofekumumeguveberuv.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/60399402321.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/dobejefobapojisufukifaf.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/kajupijeno.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301254e8ff9---rinugufefofuno.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2c76278ec21a7b78179fffb162dcb9d1/zejalinapufavazo.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/25427403581.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316216aa6d3---suxipixet.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/47224027146.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/75345078345.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/weliko.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/tidopopuruf.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/sebize.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/bilunodatekake.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/62424316591.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/nusujedoleroxeb.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9f74689e---87487211506.pdfIn PDF document text
    • 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_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 10456 bytes
SHA-256: 20cf0560e6fea9253278df6d649585c69c8f570005daa1e3b5a061b98f6e936a
font_01_sfnt_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 17760 bytes
SHA-256: 3f436a7ca512a64c4fe96716b6104368322eb74459b8d9fc311b2da925405d84
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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