Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4576d4ce4556a1d…

MALICIOUS

PDF

129.9 KB Created: 2021-07-02 05:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 72f7909fc00e7ceb57d27c52dfaa5a87 SHA-1: 669276c8b83d2587672075385b90a49de918ff66 SHA-256: e4576d4ce4556a1d8db221f8d6c8c2d6a34df95c6e70dc45632697163e8da2d7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://protectname.xyz/whoisprivacy/userfiles/files/66125580453.pdf In PDF document text
    • http://wanyuantemple.tw/userfiles/file/86129356112.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021051313041570554.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/zezuw.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/235f1997cd83b0e3afb6940a5f3d8a1b/lajasakurumolilezimifov.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/16290662001.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/degalux.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814890ae49c---mifil.pdfIn PDF document text
    • https://everestart.com/images/stories/file/38437355452.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef39e9f570---39130052869.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607262ce5ec8a---83654468318.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c709b63b8cd---46974615103.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/jubuxisapixuvafulo.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608094209259b---muvakopenumofimetimud.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/48189313817.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090651cb6e9f---sefofiz.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9865cd812---xatuzutafulusofere.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/pamigexugika.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c22cb79ee---25405179574.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/98354445551.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/bibikixoso.pdfIn PDF document text
    • http://chinazzjx.com/d/files/savuruvun.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/31699414622.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/zofugadudukodave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=isles+of+scillyPDF 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_off00019a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A56 9928 bytes
SHA-256: bd0beccada79070e42d0976fc277643d694f981e50af0d1313b4277f46fc3b62
font_01_sfnt_off0001b06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C87D 19004 bytes
SHA-256: 6b7055784d77cca691bd5882d58b59e7b18508113493d00ce95499f2c8592ec7