Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3c0cd578bd85fc…

MALICIOUS

PDF

97.7 KB Created: 2021-09-02 05:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f87a73f1128733e76e45b61870ba4e09 SHA-1: 8ef0c2c9a532eda7c5798a926c4995b55bb87f9c SHA-256: 4e3c0cd578bd85fcf46689ab25d6f4d75e306e3e3181a87c8a3ad07029ed48bf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple URLs hosted on potentially compromised infrastructure indicates a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/498ec36d69f611bb8ef39ef8aec8e11c/latewebizovugubagufitegot.pdf In PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2l87ki9ure6c3e0t87587v56qmgn9mda/dosojibatew.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7a6126329666f3d997079e2eefb5e5ed/18968715914.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/12430177086.pdfIn PDF document text
    • http://deauville.ru/files/file/94822519513.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b31476b78a---tipamiwukubibosizavesap.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/69b16f88f75b2a8d36b11703b59ca607/41090104068.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f9c2f5fdcdabe2882fc21eeff652886f/57698715677.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/fimovotazojedavigabitiku.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/18199908702.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210804053722.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/lejakozojugazumipej.pdfIn PDF document text
    • http://kme-kme.cz/files/file/54605797992.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/kuwukusezejuvaxales.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/33606688585.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/64777936524.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cde377bd34e8969149d6b4954096d223/pomotukujigewupegebimi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/pebakogemon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=nelson+mandela+long+walk+to+freedom+class+10+extra+question+answerPDF 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_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 18364 bytes
SHA-256: 68f57cab134eeb9ba65b2adbcd4e80e6654c8998fcfe6c418982408a38c0c12c
font_01_sfnt_off00014604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1B 11496 bytes
SHA-256: 35ec2325661f76cc61ae093d803f32021b1f6d41389f63fe787de803efef2f85