Malicious PDF — malware analysis report

Static analysis result for SHA-256 042b3a9505deb60a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 13:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03e71e05302867115655cb10f866b3a4 SHA-1: b8039b4e09ca7909550d54fc48d6d25328bd53ad SHA-256: 042b3a9505deb60a2dde8b823c4194864a6a172319a93beacec27fe657c47d9a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress upload directories. The ML classifier strongly indicated maliciousness, and the combination of these factors suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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://immodraft.nrw/images/architekten_agentur_images_/file/8270776584.pdf In PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03928d115---88304629964.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/pulez.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107597d29945---tametuba.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/42035290567.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/vuwejawutari.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/32d526065b63490c0167fed86546c351/47638821753.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/221136c67e6e7d6b1c4d2b652105d0c8/71184814919.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/ramejumodizebulon.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0c53bab05ac3802300e58e3a9ded5cbd/97870370020.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e60d4ba7---vajukimezevemulifib.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/xeruzobefuku.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/54327672735.pdfIn PDF document text
    • http://adveotec.com/img/file/35772064145.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/zamovizuwosi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/kitivorizigijezo.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/50865546826.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021052518153873499.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/28133094105.pdfIn PDF document text
    • http://benthanhfarm.com/images/uploads/files/56043708332.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6cb2ed59d110ebb9901c0ce6bb3f6165/watuzugidegaj.pdfIn PDF document text
    • http://leguido.net/files/wofilixasizajitoguxidovo.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/61435598160.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/xegovaguretow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=converse+inverse+contrapositive+worksheet+with+answersPDF 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_off0000bba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA8 15708 bytes
SHA-256: ab73c558ffb43af395d304f3eacc61ac69297a8ca34571d29888d802c884e6f7
font_01_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 10700 bytes
SHA-256: 8360d20eb38da13bd48ab0cec5912633892e14236910b902435864655ab13c67
font_02_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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