Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fae9f416a96416…

MALICIOUS

PDF

148.5 KB Created: 2021-06-22 10:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 20c0435c227681a96802ce1663774404 SHA-1: 950a8188133e2a8e3e14ca83826b62beb1b3e59d SHA-256: d9fae9f416a96416a434192cebfafa253d2fa2dafe8617b664feab357a9e8dc9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and contains metadata that does not provide clear user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5841

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 https://synerhu.ru/uplcv?utm_term=lil+mosey+blueberry+faygo+instrumental PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b601d4e05ce---tolilej.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971a6072416---vovinokikopigi.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/64725751359.pdfIn PDF document text
    • http://freeski.hu/freeski/file/40881127073.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/61a3082742dec3586a1f36d6366a9d8a/96367152366.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b22c79e8---72221454556.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/lumomotuxukixitudategafif.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3292c933ef9a0c2e88d10fb3b1fbc5fe/47619983674.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aaa3d6e0d---vanotozuzadagosuvimobule.pdfIn PDF document text
    • http://strandedtattoo.net/file/nipumibakegasuvirozif.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b5311baa6ffc95fdbf117a592bb7b69b/funaxitenopemumomijebe.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/j5nhvpf0nk9b9b7s3vrb8fkvpv/83891258928.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f0062407---funer.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/3484655530.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607281ec369da---79116689849.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c78b59654---xemuwaji.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/tifanetepusa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7BC 8368 bytes
SHA-256: 8b98cfa543c88724360564b38e2f325699de78558cf5b11d610b48f1c57b96bb
font_01_sfnt_off0001de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE4B 5268 bytes
SHA-256: 49b9d3e3a712ff4f8f1167b98fa0834930a8ae54d87127af4b921fd2366e8b22
font_02_sfnt_off0001f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F028 7900 bytes
SHA-256: e8e56912c321d1d9e26902e86ce5710f709967aaab19295439cfa96f7a509cd0
font_03_sfnt_off000206db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206DB 6496 bytes
SHA-256: 80ccd63da2a66f9f763f1b31e1290c669f73d86081b431d0d79895c32f8962df
font_04_sfnt_off000217db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217DB 16864 bytes
SHA-256: 6bbca36c6185c92c114cb56fbdbd18882e6cfdd053cb62fa59d4daf708e539b2