Malicious PDF — malware analysis report

Static analysis result for SHA-256 82697d38bb3a5839…

MALICIOUS

PDF

75.6 KB Created: 2021-09-23 15:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 359f8a67d4e4e9f3c950399c7a4315f7 SHA-1: 6afa5a2256f2db2c187c9980a064c2a0ccafa423 SHA-256: 82697d38bb3a583969d1fbec2c7458871573be7933cb9d06ab0732c34fea6da8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many of which point to compromised websites or disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware distribution tool. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vietdubai.com/userfiles/file/52544505197.pdf In PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/6191600436.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/6d40eoftbhb92ure5lku00r2ga/noronibinaf.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/gijesataxofuz.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/21599666474.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/wuzefuzivadorapamipizile.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/guwepuxozuwijoduvodib.pdfIn PDF document text
    • https://onlinendttraining.net/files/75173164823.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/31539788874.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/96444984500.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/76380512072.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2c62103b9---23152577692.pdfIn PDF document text
    • http://puisan.ru/uploads/file/60251568568.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c14d2185a9---lesovapomogumelawoko.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/54642712502.pdfIn PDF document text
    • https://istanajp.com/contents/files/ranalom.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/1626237825.pdfIn PDF document text
    • http://word.mn/uploads/assets/fomitixolefalasimewelar.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc01847257---nalupibonusuvanasaberu.pdfIn PDF document text
    • https://gozdekadife.com/resimler/files/tafiban.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0b82bcf6b---kinax.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/2365231821.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/67975987837.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/47770556788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+add+outlook+contactsPDF 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_off0000c72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72E 16244 bytes
SHA-256: 6499825722bb4397e573310af3447e694281f034e86c8088b3816049e9e74622
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 10404 bytes
SHA-256: 236bfc454cd704e8bfbbaf6afb8fae084b7d57bc8bd579a25158ca6f1d4fb5fc

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