Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa572772acfc03f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 05:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a22aba4c5de90416f4b3dc3d74c69781 SHA-1: 0f7b72ce682c2b9e472d52278e0dc0206c1a236a SHA-256: 4fa572772acfc03fa5b8d497bd93328bc5955f0741e1df8ecad4c31dd153a71c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=this+is+us+season+1+free+online PDF link annotation
    • http://audidalys.lt/ckfinder/userfiles/files/2910875274.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/74650706552.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/88981770939.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/38138427649.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/rijevovapun.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/xuzasukoromawebamowagexa.pdfIn PDF document text
    • http://ahknchem.com/upload/files/vovekasesa.pdfIn PDF document text
    • https://tepihtrava.rs/files/tifebomukaridiwagazis.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/gipapugirenejumaxafomasad.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/nukiti.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/nanasojurod.pdfIn PDF document text
    • https://fivetc.net/uploads/files/zikenekubuwipikopiko.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/tawisapisibogulus.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/wijiduvunemoxemijizibula.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/femij.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/kikelulubawowuweletapev.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/61323869333.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/boxebekapotesifuz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146345ca0ae9---vojixujegijepugeripufebex.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330550c7012---11070132559.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/nixizukedufasinotili.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f278a4afa3---81335960326.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/41163088759.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902095556694153.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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 17796 bytes
SHA-256: 16476738cc3ac06d0e685e62afeff0cb1cfbadcbedd40276a8095bf0c76e69a9
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 10328 bytes
SHA-256: 383d707e1eff03d1203cf928c79fb4ed5037e0effd1a8bfe33e897b6b8b12359
font_02_sfnt_off000120d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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