Malicious PDF — malware analysis report

Static analysis result for SHA-256 d669ad795a825bcb…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 14:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ba707a652bfcaed691f38dfd3e285cb3 SHA-1: 42ba27c2d8752ba4943c408c557af2f0b79ed9c4 SHA-256: d669ad795a825bcbf860db64b4823146c36654017fc391de8be5251b3e5bfd7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The 'SE_INVOICE_LURE' heuristic suggests a phishing or payment scam pretext. While no scripts were directly extracted, the presence of multiple external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://huntic.ru/uplcv?utm_term=back+and+forth+significado PDF link annotation
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0dd273a3d1daf934098321f0dd6866b2/10496908042.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/43372499277.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/wulexisixejido.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/99865305947.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d2377e6d2c6e5bbb6df236060854b35c/satigunapopumili.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/dipigilejetusuker.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/41256062596.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/60405802250.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c54071b0b85001ca97fce1bb986f84bb/xabitegenewowukakitutovu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/efr492pnbht42u9eris5k52j7i/29349805460.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/nqo7b60k5v88v54oj0vrui1ave/bodizuladubotefe.pdfIn PDF document text
    • https://ocw.tw/uploads/files/2840569776.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160746d18216c4---xowukexexowupurepuzemanu.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/saron.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/t2tct56sg7k46slaq0ei07n5q2/dawas.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/wusosanopowisanixu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/afa56bdc2957ce638d6d6bc9cf4add0c/vaxizuxamenozabifiwaxose.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/84980687418.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607072b574512---zolerifawatupabiwiluke.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/zibikugozuzudapusitevap.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/97056209203.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/regipugimonijidame.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 18896 bytes
SHA-256: 3a20179f4de7192978322bbc934530856bd860d582d4afb13a2ec91ade12a1ef
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEA 16600 bytes
SHA-256: a60bac0e09bef4bf6d80298fd1c15696f122d76ed06a2835a0b295c983181028
font_03_sfnt_off0001324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 10724 bytes
SHA-256: 49b3dc6a8e6e663d6b60c3df99cce8431bde169eb17e5689b1ef25b57921eb60

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