Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c456afcc9d7ac5d…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 03:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0437beebb2096c8e419523c22050b76e SHA-1: a87ffb425e3cbc0d0abf8f2d8cf693f4c06b73b2 SHA-256: 4c456afcc9d7ac5dbad63033f8c0bef7d855ad701b7eee4ec0561051f38c5f4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://efuturesthai.com/uploads/file/sotuxuguvemunene.pdf In PDF document text
    • https://slezanie.eu/userfiles/file/juwotivimoturidevokipadid.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/pajunajizawu.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/zapirisi.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/zukuzawimuvorusam.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/tiboxifadabifejo.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/22206159254.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/pivober.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/e69uv6qtpu7aennbvi0lvnieha/52276362046.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/zulexo.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15788029531.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/65352673498.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/38612253971.pdfIn PDF document text
    • http://bndweb.nl/upload/files/xivegupej.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/53431593984.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144308c938fd---zopowam.pdfIn PDF document text
    • http://videocycling.info/files/file/76794823510.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/g2tebp03009fbghsnjc070i1a3/fevedazowoxasanorobu.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/javifuvuzinodaviboji.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/rodod.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/dusufoxojewevoposu.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210914122052.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/96571309860.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0a31c570---25173538372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=scanner+document+apkPDF 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_off0000b94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 15936 bytes
SHA-256: 4927e4d38115d133e0d1369df6815ae7f32a39d8916973170772adadd2ece707
font_02_sfnt_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 10636 bytes
SHA-256: 015b1b3870a8fa5e0a3c47a564d9abc1baf873dee61c3943b4078a5756cfac36