Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5eed99ea8832b1d…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 19:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca876a56e8b9ed66a22097b376f5d352 SHA-1: 6533ce6588086dbd49df967215ad3171750f9292 SHA-256: e5eed99ea8832b1d5e51183eadc3a342444591d6eb25523f069f76eaf259d7b0
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS upload directories or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://meijialx.com/ckfinder/userfiles/files/nodufelanegepijamowo.pdf
    • https://pinyardim.com/calisma2/files/uploads/16614742400.pdf
    • http://aadcnfgl.netsociality.com/upload/files/50783360931.pdf
    • http://alphanaturehk.com/userfiles/file/47775543254.pdf
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/jedovize.pdf
    • http://clickvay.com/upload/files/90751492510.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3003eb65f7---95032356884.pdf
    • http://zsdbiopharm.com/upload/files/mulinafabelinenaduju.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3ba4bdb0905e2584ccbb88dce2660727/metadoxagidolujirimum.pdf
    • http://knuhpharm.kr/userfiles/file/20210616163702.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2769727c01---94201464295.pdf
    • https://xanbiente.de/userfiles/file/58067369482.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c1e5c6cf7d---33898782886.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/27873335096.pdf
    • http://moskvaznaet.ru/upload/files/buladulusunug.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6t346o3p05emdrbmatjv9o94ge/pogabezutazakeruto.pdf
    • https://tyeetomsfishing.com/userfiles/file/wobimelenuxapasabofimako.pdf
    • http://tulga.ru/editor/files/38283193493.pdf
    • https://ckmusicdesign.nl/userfiles/file/kibojukozokesolet.pdf
    • http://remaining-mc.de/userfiles/file/66723563664.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/837b2696bce21388376039b337beba0a/96702085477.pdf
    • https://webshopplus.nl/app/webroot/files/userfiles/files/14592121274.pdf
    • https://securitydm.com/slicice/file/meganonufaw.pdf
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/48885059973.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=future+perfect+negative+exercises+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_off0000f7de.bin
b5cbc05b297e5f109b2a4b5ff675a11479b3f5c3053c9459c95efb2c3009c2e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 18604 bytes
font_01_sfnt_off000127f0.bin
aded238fc2df56d5d0d9e34d34375948032ec6df6bcca82e1ae997b020c6aedf
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 10876 bytes
font_02_sfnt_off0001410d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1410D 16792 bytes