Malicious PDF — malware analysis report

Static analysis result for SHA-256 254f8411cc754f4a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 10:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14ce02a2f1f63988f22ba49a71214e8c SHA-1: 65214a7561fbcf7983561f0a2e3287818659e4f1 SHA-256: 254f8411cc754f4a92b50265a15ada655c04f0ad6ba6815d652833ca57cde47c
104 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ML classifier strongly indicates maliciousness. The presence of a 'download button' lure suggests an attempt to trick the user into downloading further malicious content. The document's structure and embedded URLs are consistent with a malicious link farm designed for SEO poisoning or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jjw-led.com/userfiles/file/65980286700.pdf In PDF document text
    • https://protum.se/file/87980498407.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/gojutomimifixirij.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/28174249832.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a030c352a3---kinawitexewisevarujagoxe.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/giloxikanodegibovisizuf.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/jezonosogupurasetopabife.pdfIn PDF document text
    • http://namngonviet.com/user-/files/39672201351.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/bubora.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/lufirurilogematel.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/zepulijejezor.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5dba6f9bd950a2f9f976a536da5f6c2d/bileposez.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/rojamawifuxajexujafiw.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210903134442.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/rezavi.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210908_6921708743A86DF4.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329e68786a0---59300026533.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/8675310746.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/48841176738.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f87bfbae---63826206342.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/28771047815.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130200a103cb---dexemutedi.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/48569088539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=atari+2600+android+emulatorPDF 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_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 18192 bytes
SHA-256: d1912aa335723fc05e84eefb25289e2a027d7928388b769ab134b7ce752d5c88
font_01_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4E 10732 bytes
SHA-256: fd0f47093cba7d38942d305ef53d0703f64289df52661e184d3749e4b0eee475

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