Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00017f98a477d0c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 01:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4b66a2c963970ac1740ff68147a2445 SHA-1: 4a2e728d283a496c84147d44e8f64e240241735d SHA-256: e00017f98a477d0c8a8b298266689755036a4b62cdc3b7079a781f3e0317087c
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of multiple external URI heuristics further supports this. The document's purpose appears to be to lure users into clicking these links, potentially leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://smidgel.ru/uplcv?utm_term=escape+from+alcatraz+full+movie+online
    • http://soupworld.de/upload/file/77802058961.pdf
    • http://insureavisitor.com/userfiles/file/sateden.pdf
    • http://csptech.net/admin/userfiles/file/bojunewudujixipinob.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/edf6a89392d454098eca4b859a5afafb/74037063369.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202109200216240972.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075b067452---demipudut.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/32759433787.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476a0b57c92---bujudekukojazom.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/repapatipanatazivon.pdf
    • http://st-johnson.com/Uploadfiles/files/281870134.pdf
    • http://behtarinekhodetbash.com/files/files/jivojigejegigubu.pdf
    • https://bdata.vn/upload/files/zirur.pdf
    • http://beautifulmoda.com/userfiles/files/48083984582.pdf
    • http://yjccnc.com/upload/files/11898706094.pdf
    • http://huanghels.com/filespath/files/20210916044852.pdf
    • https://baohohoanglong.com/userfiles/file/jisaweselibodekiweka.pdf
    • http://www.zywawiara.pl/pliki/69011708920.pdf
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210911081832.pdf
    • https://deesudcoolingtower.com/userfiles/file/lenetabak.pdf
    • http://annassteen.com/ckfinder/userfiles/files/44804092202.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9n8ifeld8bh90a5i60pn592rdt/77588980202.pdf
    • https://xrtradingfeedback.com/cmsimages/file/52012476708.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/58508863034.pdf
    • http://biaikatolikus.hu/files/file/muxasesarifimeven.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 16792 bytes
font_01_sfnt_off0000f3b0.bin
67537aa90d16ec9bd95c77f8b29015c9ad21fc0113c47d391c22de476b7a8f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 10848 bytes
font_02_sfnt_off00010cc6.bin
84fb747fbce7847893826f8f86c0f63bb103d6008036c86e96c920337e7a8754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 17436 bytes

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