Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7e06bb0770a777…

MALICIOUS

PDF

91.6 KB Created: 2021-08-10 14:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 079187567f581352fe9c895baaa5c5ef SHA-1: a8c92b05d0a4e0b3b0cb287cd9e3c15cd0a85d5f SHA-256: fc7e06bb0770a7772bb8c8ec2c7060c1692b8d4c10a925225bd78a1100f8b2a3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or content-luring campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://lnianemarzenie.pl/userfiles/file/vopanosujojetim.pdf In PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/58663662837.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/495f6682829a4cb675dd290b2336f4b6/45470196556.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/01196893482095daab33a5b78f67d8fc/86480165518.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/gukiruvexag.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075739027cd0---24062827388.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f19c194df01---64092690596.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/11979244763.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/67564202097.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/maboragimafunirafas.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/vazitikojasixitiwegodito.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/60852900645.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a13f478c2508b95f6949d71e3405708f/dixivu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3632im34t3epq5v3cb89ma0ttb/senawafakobunev.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/wazuzuge.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/22147444614.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/xagesi.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/matetelukerezofusositur.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074789b68846---44354183447.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2285d19b---1582959937.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tijelilos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+identify+a+groin+injuryPDF 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_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 16816 bytes
SHA-256: a23818bb19562a6baaf22921f810dcd9f3ed8d88f31031c499942fefdbbd46de
font_02_sfnt_off0001476c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476C 10736 bytes
SHA-256: 0fa5b8f7e5b0df36552587ae9f12d8c2b1e4f2bf467961daca77583068cb2195