Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b82580f25d7654…

MALICIOUS

PDF

75.6 KB Created: 2021-09-08 19:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d0333ff7881edf30bf6edfd3354dd30 SHA-1: 1c44d549ccf0face4b6e2ec11d14badd3b5e6d34 SHA-256: 94b82580f25d76541a4200c07957f9f6e2ed28db104f017a7aa7b3671314a4cd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of external URIs, some pointing to raw IP addresses and compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://vistobrasil.net/uploads/file/lafozunibiregatikiliz.pdf In PDF document text
    • http://abwingsjanaf.com/uploads/files/potepijitamesopizalilole.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5f8053765d6c1ef9e6e97c48605371aa/wevudas.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/zimagorewexototakorako.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613472a2227dc---96574405156.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/zomamebe.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/27211377421.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383461230d6---65884795506.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/70399810145.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134401c69c6e---40421260965.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384f7b2f8b1---43540423501.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/gonafapepifimozadogiwij.pdfIn PDF document text
    • http://cke.hk/userfiles/17388813540.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zetoxewonupizadanuf.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/97002031951.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613207a4c0442---99733110621.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/54987173924.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/bewikadijaxonolexosa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd75b2b64---76961269980.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/pipirakelu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebd42f3d1---wumaxamedakafabawi.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/05/file/20210905_185857_111.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5b8655b6---nuvotutusobo.pdfPDF link annotation
    • https://artedeeducar.com.br/ckfinder/userfiles/files/tonajejijus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=macroscale+and+microscale+experiments+pdfPDF 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_off0000c47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47D 10876 bytes
SHA-256: 005c4928ee55929ad28a2bcd4ef4b5f8cd241bba459bc14396689031dc1bb0e7
font_01_sfnt_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 16908 bytes
SHA-256: 7fa2d8b260bc7c84133b057ea2ebf28d80a1b146679172ee1352c1853d8c99bf

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