Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab450d77ccd018cf…

MALICIOUS

PDF

93.8 KB Created: 2021-09-23 10:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ed6795bcfe069c227742ef457c7816e9 SHA-1: fc5d93fa23eb416fcba00f345136a18cd18ae37a SHA-256: ab450d77ccd018cf674014b38053bd80a1f9bafca58b3e2f13a4667d212361da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=how+to+move+contacts+to+sim+card+android PDF link annotation
    • https://aashianarealty.com/file/36735786927.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/jagifazovulebidituruxo.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/98148463153.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/58vu9p5uu77vptb3m427hckolm/filelufewebiwun.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/65981970931.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/mawamamukenogo.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/lilidakonaxozosoriva.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/78816445214.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/77472765681.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/639d3410d8ab73e24f12190bd9c8eaf0/xuxewodudinejawexat.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/firalokomuj.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/88891372906.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/dunowiwurutalewetezefala.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407572ac0ed---mebawegimo.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/tesosudowev.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/99db3d7d51aaf8469a487a9d20e15afe.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7206113c6b35a65577c7df242e336fab/sunevumebosa.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/namovevefezof.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/setovawiwediwek.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/razoxojekatavisi.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/84270024557.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/febikebedexiwaxenu.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/zorixifuvegejimixemanaga.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/82388572285.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_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 18288 bytes
SHA-256: 553c1ec7951d072881e2b6ef16cfdff3695463938ba8b11a57aa8e2f980e4beb
font_01_sfnt_off000138d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D7 10628 bytes
SHA-256: 4d7caa7a6b623f97b591fe81aaf4dac7126d7e35b530c624c576f39f94aa5662
font_02_sfnt_off0001512b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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