Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adcad51f36975bd…

MALICIOUS

PDF

84.0 KB Created: 2021-08-03 01:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b72846033587b401ccdef17d2017c07f SHA-1: 08367fefa534b21c5a14ce3ac47f7343b2a9e4a4 SHA-256: 7adcad51f36975bdbe426d3f0aa516ee28b857ddb5df60f6b92c980dccbd53c4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to obtain a password for a separate archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://webcertain.net/contentupload/fckeditorUploads/organization_/file/kekedakujujuweko.pdf In PDF document text
    • https://kham.vn/userfiles/file/ninubofufa.pdfIn PDF document text
    • http://qzgj.cn/upload/file/62897796735.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/59179442327.pdfIn PDF document text
    • https://memoservicesrl.it/file/xugobusejekosexeg.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f8a96fdf---zibilibojelawu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c774778f---62277339735.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/703678390d2fc8a3e27f3cdcbc8d1eb7/povemamefokazukililo.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/058c973c1c56a75958530aba09b38c4e/jejaziteginusedewe.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a74ed99d1d7---julawelupotelurarutomaliv.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/libajepivoso.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/11024766271.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/rexumaj.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/66767219715.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/46323359988.pdfIn PDF document text
    • http://innotack.com/userfiles/files/53815564304.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/wonapabenapugujawar.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610487ae7eaa5---92492660114.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/25835486068.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/2867350381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+check+airpods+serial+number+is+realPDF 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_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 11188 bytes
SHA-256: 04417fa8e48394221ecc2611fe0faff39e3fe91704fb91ac2890eb67d79bc87d
font_01_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 16388 bytes
SHA-256: 9fe50d70a1480c43ca5c0a18a5493c64fddcd848336b80e8e21ca73ffcf36afd
font_02_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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