Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9aa14d085a7b393…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 11:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75a0c9d31e754decec513c42915ba19e SHA-1: 35e507b8d7686003952d88f41c8bbc53f2b1fdc1 SHA-256: a9aa14d085a7b393348e3e43d28b36f101b756e84530e0a33416d624efd1972f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through a link farm. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://garglob.ru/uplcv?utm_term=audify+music+player+mod+apk PDF link annotation
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/42131535126.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5b193acc0a1a74eba9de040ad1ccc809/kurelufiwudasodewagav.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/zozuborob.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c5eea473f---vufawomisatitexeroniwaxen.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/57377061883.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/gukomovudelunedabir.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/5130432807.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/50fac0572ad53a001d266b16f862cbeb/63921750517.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/27644598045.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/0d24533c352439b7928d2f53bf8ab29a.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/30452017056.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/18865608121.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/nozamojinazimekulenelek.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/82230535656.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9867d0cd---ketusutazenobosara.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/nudetom.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/v9m8535sgv1okonmoimltov5vd/60160800465.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/77205671079.pdfIn PDF document text
    • http://signauction.net/userfiles/file/rugefolofujojejivi.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109041756393412.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/24111344631.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/gufitivudawupifo.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/16383692091.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/84304033760.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/35723574060.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_off0000be77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE77 17660 bytes
SHA-256: 0ab4024df68b86f9635127b31408c4bdbbe0ec3b401ee92ec832757c301cc1c6
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 10868 bytes
SHA-256: 3c49fa1a338a02faf5cff39c86807a5fcd058e36d702ed3dd7462c07a03bb646
font_02_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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