Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a57b8d6a901bf8…

MALICIOUS

PDF

95.9 KB Created: 2021-09-18 22:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 225a182ca01edd42df6954b4b361d6f4 SHA-1: 5b03c030c6bceb84146f774d60ee2632afee45d3 SHA-256: 58a57b8d6a901bf89298dd4b660cf9b931f8a4f19a343c363ef37e62be900793
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://infrive.ru/uplcv?utm_term=how+to+get+sd+card+to+work+on+android PDF link annotation
    • http://cbgnfinance.com/userfiles/file/31369137966.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/zufewaxemiwirafigifa.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/vipekebabomasaziwaf.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/fadojelax.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/64120697351.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vll0a0q616pr6q2dcrpvvvor00/sugitojujuxulokelux.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-4/20210904023050919586.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/kotenajudax.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447c068e5a5---tegodib.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d6145d49c---fonelafexiwoxexojuju.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/48430826111.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/nojisufufusa.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/lomavosijuwuditaxi.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210910_4F0249B66070B54C.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/jibajuroriruni.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff546e40fa---vutavukoxeramikigizok.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/26775069675.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/karetuwisiwunane.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/nukete.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/wovapiwaribebaripek.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/7088611107.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/63167835171.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/62798394343.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_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 10668 bytes
SHA-256: b99459344b4bc9d8533278ff84affa901e4c0f279a16af48755b5f7b32dd263f
font_01_sfnt_off000128ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14100 18744 bytes
SHA-256: 7ee100989999950a7cf8a8218bdd660d0fb3e449cd74125d4a163e015aada27f

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