Malicious PDF — malware analysis report

Static analysis result for SHA-256 65409787739421c9…

MALICIOUS

PDF

92.5 KB Created: 2021-07-31 14:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3dfb656f408ea4a6497237a18554376 SHA-1: fe80b083d89544b85d9f3f794df78f7ba4883936 SHA-256: 65409787739421c935379cded886569c1013c20f2a0250d59b5a07b5e0c84e27
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised CMS upload links and SEO disposable link farms points to a deliberate effort to obscure the final malicious destination.

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 https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c5bae7f827c25e48350fcd32a0c4e08b/fujomekulukato.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/96809746347.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/newadote.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed683d964---tefofifuzuwabejamu.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/86682512892.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/51e5aa06fb1a5fb27f4c498a61ddeb41/70586413839.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/rezefimuvugoriseteza.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/9565583827.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f4c738fa9---jovidefozoz.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081590876b89---76802511501.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160902ff2bce36---59585912162.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dmi11lmpnfobl15lvtdr8kgdf2/wizagobukobuxanibitugo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe229a7af6---86192825597.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/zedenemitunesapaxalirumu.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/88254839841.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c12c52c9d2ec9d130222f542ab9d3b2d/94733902977.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/mazilobiwusube.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607720f0c026e---bezunilimetizetokenopira.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/b07a62c7f034c3d2f5cbe22f511c9299/tigegozanawavenis.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ccf70621b---10183529475.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/86363133554.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/jitiduzunubedixubu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n8h8h7sukdcp298ns2p78us1h7/41717688184.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff685b45331---38519235290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+connect+redmi+airdots+to+iphone+xPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 17272 bytes
SHA-256: fd3ce65bf82ea3608253d95bfcd3fdc7178b26578e3378c35b42b6014d8e30c3
font_01_sfnt_off00013297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAE 10912 bytes
SHA-256: 9aef3cca26e52fc97ee72d2e51f8302d310a0db1e0522c881fe11ded0e1f6df1

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