Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40f4dcf9e5d0b67…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 09:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bda9997ecf91bb32cb1ee93f31d16af2 SHA-1: 33b9bdee888c997f409e8f123a16cb8ff66f16e1 SHA-256: e40f4dcf9e5d0b67364606a1f17abc61dd98e039a9e3940644786b747b3e0333
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness, and the combination of JavaScript and link farming suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ayrh.internet-match.com/upload/files/suvelikulisefapivu.pdf In PDF document text
    • http://zechnerbau.at/images/content/files/zigevurodimepiwolavevoma.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/33435876460.pdfIn PDF document text
    • http://change4best.ru/upload/file/dexizur.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/54255138170.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/35322614118.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141561dd6f4f---turubigu.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/teruvaxupuwize.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8d09f028b181834809ee729a9d709b0b/12591985252.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336ee60a3ab---1200379306.pdfIn PDF document text
    • http://weingut-suppan.at/files/26132760812.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/garud.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a7da0087---45805772177.pdfIn PDF document text
    • http://mc-opony.pl/files/file/39357408290.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/lepenid.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/d3de92784edf5c486a94f29d2ac5aec9/84000747442.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/36341651540.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f825bfc173a50d756c43c3106e21243c/7974158563.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/59482543706.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/82733713636.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/tinujuso.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210916101107.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614253d2f2a91---26163303318.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/zewisutifemesud.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210901055658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mp4+to+mp3+youtube+downloaderPDF 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_off0000c49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49A 10976 bytes
SHA-256: 26d063a44ba1caf812499b9a998e9c3d96a487e53df3d87b00b124575438fbde
font_01_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 19912 bytes
SHA-256: 46d21271b42da23d57db9e2e70fbb563cc64acdea71d30a58ccb640e5215e498

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