Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7b48fa5da8d482…

MALICIOUS

PDF

79.8 KB Created: 2021-10-23 01:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f86909d02f51cf6840ea2407daf28eab SHA-1: 738ec26a14c79f20bf5363d51029e176eb23ac5b SHA-256: 9a7b48fa5da8d482e7a377168029f9bc75157c0a05bf55d90c0ba6f93d132352
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or facilitate SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or spam distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://samafb.org/uploadfilefiles/zagojo.pdf In PDF document text
    • http://bellina.pl/userfiles/file/22901472230.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/gawibinex.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161665c08e238e---parajisugomivodekowizifiz.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/11408530254.pdfIn PDF document text
    • https://svltv.in/userfiles/files/58403523759.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/64323646864.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/mudifobamapakurelobubase.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/bevizujiz.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fcbe1712867bbac90e9f4eb11263e43f/boxanerusedaludidolew.pdfIn PDF document text
    • http://citra.cl/userfiles/file/72564443520.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/sukisexebivizeseviwow.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/32b6780efcd9cdad89851f094829053c/2026074430.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/59421624398.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161665c9b7dd90---14752986210.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/2754047406.pdfIn PDF document text
    • http://rideco.hu/upload/file/vorafozanugoleboruketexap.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/5729245871.pdfIn PDF document text
    • http://upakuika.com/img/file/32352318694.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/8893037263.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/36808197549.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wavopovexi.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/bepofufuvotaroxovame.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q4t936gk4b9crskbgcfgdr6uc0/gasobifezulomutup.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/3291738042.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/23D8k0Ec_6w/uplcv?utm_term=discovery+model+motor+engine+kit+instructions+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_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 16184 bytes
SHA-256: 31160c08e82fe1e88f9d248e9ca4f563c1ae4ddc6cba143e2fedc562558c3d4b
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 11172 bytes
SHA-256: dd7a9ab3796c70dd6a687987546b4ad2221148a53f012981c95c697bfc297f66
font_02_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1