Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2d25c42fd9ab50…

MALICIOUS

PDF

89.9 KB Created: 2021-08-14 02:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef0a3c563fc87889318b8d3a1033de29 SHA-1: 8de31bd44d977124151f837c445aeb8f00bc9298 SHA-256: 4b2d25c42fd9ab50dd077b437c7242c0f8584b8a435257a61c6bacfc66bd59f2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=hotel+transylvania+3+tamil+dubbed+movie+download+in+isaimini PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333c6a4f09---lenazulopofakanoza.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608042c8d6cdd---gijisonigibib.pdfIn PDF document text
    • http://vuason.vn/upload/files/17243370912.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/lereliboluzogejo.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/sodujefobuxumomatupifo.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/bogavufeb.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/89642893984.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/ruxevem.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08c9c8199f---rukizakevox.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/922e463lratvba2ja0n58mq2ni/faxanipozes.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ac2fe491ea6103ad46a838ff66e82d78/4051970653.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1p9cndcdkh4a9cr2pcjhffti30/sedatorobusetuwisewowejot.pdfIn PDF document text
    • http://schokobrunnen.com/idata/ditinibewiza.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/darokukepipab.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f840abacfcd---vawux.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///sepifixulaxa.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/1852058569.pdfIn PDF document text
    • http://yongqingtech.com/d/files/woxiladedovejurivorebemu.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/71382051476.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/91c18d82a341d7d142e03f9ac1923000/soralaraza.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1c42fd2c23353288b62169c09d98151b/vavorebumifazo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 11080 bytes
SHA-256: 253de9c71cf4671d4358e244fec1cdb69d394a0460f2603bab41b6bc23d9964a
font_01_sfnt_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 2572 bytes
SHA-256: 8f658e67c16558b7bfdca900a5cd6ba520368a144db43ac0a229f3878004859b
font_02_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 19376 bytes
SHA-256: 7d10be51f6a7d2f98a4ebc0ccac910d676c17c7ec7473056eeace4165b7860e8

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